Import mbed TLS 1.3.11 as security/mbedtls.

This is former security/polarssl rebranded under a new name, keeping the same
API though and providing the previous libs as symlinks, so should be used as
as drop-in replacement for security/polarssl.

Changelog since polarssl-1.3.9 follows.

= mbed TLS 1.3.11 released 2015-06-04

Security
   * With authmode set to SSL_VERIFY_OPTIONAL, verification of keyUsage and
     extendedKeyUsage on the leaf certificate was lost (results not accessible
     via ssl_get_verify_results()).
   * Add countermeasure against "Lucky 13 strikes back" cache-based attack,
     https://dl.acm.org/citation.cfm?id=2714625

Features
   * Improve ECC performance by using more efficient doubling formulas
     (contributed by Peter Dettman).
   * Add x509_crt_verify_info() to display certificate verification results.
   * Add support for reading DH parameters with privateValueLength included
     (contributed by Daniel Kahn Gillmor).
   * Add support for bit strings in X.509 names (request by Fredrik Axelsson).
   * Add support for id-at-uniqueIdentifier in X.509 names.
   * Add support for overriding snprintf() (except on Windows) and exit() in
     the platform layer.
   * Add an option to use macros instead of function pointers in the platform
     layer (helps get rid of unwanted references).
   * Improved Makefiles for Windows targets by fixing library targets and making
     cross-compilation easier (thanks to Alon Bar-Lev).
   * The benchmark program also prints heap usage for public-key primitives
     if POLARSSL_MEMORY_BUFFER_ALLOC_C and POLARSSL_MEMORY_DEBUG are defined.
   * New script ecc-heap.sh helps measuring the impact of ECC parameters on
     speed and RAM (heap only for now) usage.
   * New script memory.sh helps measuring the ROM and RAM requirements of two
     reduced configurations (PSK-CCM and NSA suite B).
   * Add config flag POLARSSL_DEPRECATED_WARNING (off by default) to produce
     warnings on use of deprecated functions (with GCC and Clang only).
   * Add config flag POLARSSL_DEPRECATED_REMOVED (off by default) to produce
     errors on use of deprecated functions.

Bugfix
   * Fix compile errors with PLATFORM_NO_STD_FUNCTIONS.
   * Fix compile error with PLATFORM_EXIT_ALT (thanks to Rafał Przywara).
   * Fix bug in entropy.c when THREADING_C is also enabled that caused
     entropy_free() to crash (thanks to Rafał Przywara).
   * Fix memory leak when gcm_setkey() and ccm_setkey() are used more than
     once on the same context.
   * Fix bug in ssl_mail_client when password is longer that username (found
     by Bruno Pape).
   * Fix undefined behaviour (memcmp( NULL, NULL, 0 );) in X.509 modules
     (detected by Clang's 3.6 UBSan).
   * mpi_size() and mpi_msb() would segfault when called on an mpi that is
     initialized but not set (found by pravic).
   * Fix detection of support for getrandom() on Linux (reported by syzzer) by
     doing it at runtime (using uname) rather that compile time.
   * Fix handling of symlinks by "make install" (found by Gaël PORTAY).
   * Fix potential NULL pointer dereference (not trigerrable remotely) when
     ssl_write() is called before the handshake is finished (introduced in
     1.3.10) (first reported by Martin Blumenstingl).
   * Fix bug in pk_parse_key() that caused some valid private EC keys to be
     rejected.
   * Fix bug in Via Padlock support (found by Nikos Mavrogiannopoulos).
   * Fix thread safety bug in RSA operations (found by Fredrik Axelsson).
   * Fix hardclock() (only used in the benchmarking program) with some
     versions of mingw64 (found by kxjhlele).
   * Fix warnings from mingw64 in timing.c (found by kxjklele).
   * Fix potential unintended sign extension in asn1_get_len() on 64-bit
     platforms.
   * Fix potential memory leak in ssl_set_psk() (found by Mansour Moufid).
   * Fix compile error when POLARSSL_SSL_DISABLE_RENEGOTATION and
     POLARSSL_SSL_SSESSION_TICKETS where both enabled in config.h (introduced
     in 1.3.10).
   * Add missing extern "C" guard in aesni.h (reported by amir zamani).
   * Add missing dependency on SHA-256 in some x509 programs (reported by
     Gergely Budai).
   * Fix bug related to ssl_set_curves(): the client didn't check that the
     curve picked by the server was actually allowed.

Changes
   * Remove bias in mpi_gen_prime (contributed by Pascal Junod).
   * Remove potential sources of timing variations (some contributed by Pascal
     Junod).
   * Options POLARSSL_HAVE_INT8 and POLARSSL_HAVE_INT16 are deprecated.
   * Enabling POLARSSL_NET_C without POLARSSL_HAVE_IPV6 is deprecated.
   * compat-1.2.h and openssl.h are deprecated.
   * Adjusting/overriding CFLAGS and LDFLAGS with the make build system is now
     more flexible (warning: OFLAGS is not used any more) (see the README)
     (contributed by Alon Bar-Lev).
   * ssl_set_own_cert() no longer calls pk_check_pair() since the
     performance impact was bad for some users (this was introduced in 1.3.10).
   * Move from SHA-1 to SHA-256 in example programs using signatures
     (suggested by Thorsten Mühlfelder).
   * Remove some unneeded inclusions of header files from the standard library
     "minimize" others (eg use stddef.h if only size_t is needed).
   * Change #include lines in test files to use double quotes instead of angle
     brackets for uniformity with the rest of the code.
   * Remove dependency on sscanf() in X.509 parsing modules.

= mbed TLS 1.3.10 released 2015-02-09
Security
   * NULL pointer dereference in the buffer-based allocator when the buffer is
     full and polarssl_free() is called (found by Mark Hasemeyer)
     (only possible if POLARSSL_MEMORY_BUFFER_ALLOC_C is enabled, which it is
     not by default).
   * Fix remotely-triggerable uninitialised pointer dereference caused by
     crafted X.509 certificate (TLS server is not affected if it doesn't ask for a
     client certificate) (found using Codenomicon Defensics).
   * Fix remotely-triggerable memory leak caused by crafted X.509 certificates
     (TLS server is not affected if it doesn't ask for a client certificate)
     (found using Codenomicon Defensics).
   * Fix potential stack overflow while parsing crafted X.509 certificates
     (TLS server is not affected if it doesn't ask for a client certificate)
     (found using Codenomicon Defensics).
   * Fix timing difference that could theoretically lead to a
     Bleichenbacher-style attack in the RSA and RSA-PSK key exchanges
     (reported by Sebastian Schinzel).

Features
   * Add support for FALLBACK_SCSV (draft-ietf-tls-downgrade-scsv).
   * Add support for Extended Master Secret (draft-ietf-tls-session-hash).
   * Add support for Encrypt-then-MAC (RFC 7366).
   * Add function pk_check_pair() to test if public and private keys match.
   * Add x509_crl_parse_der().
   * Add compile-time option POLARSSL_X509_MAX_INTERMEDIATE_CA to limit the
     length of an X.509 verification chain.
   * Support for renegotiation can now be disabled at compile-time
   * Support for 1/n-1 record splitting, a countermeasure against BEAST.
   * Certificate selection based on signature hash, preferring SHA-1 over SHA-2
     for pre-1.2 clients when multiple certificates are available.
   * Add support for getrandom() syscall on recent Linux kernels with Glibc or
     a compatible enough libc (eg uClibc).
   * Add ssl_set_arc4_support() to make it easier to disable RC4 at runtime
     while using the default ciphersuite list.
   * Added new error codes and debug messages about selection of
     ciphersuite/certificate.

Bugfix
   * Stack buffer overflow if ctr_drbg_update() is called with too large
     add_len (found by Jean-Philippe Aumasson) (not triggerable remotely).
   * Possible buffer overflow of length at most POLARSSL_MEMORY_ALIGN_MULTIPLE
     if memory_buffer_alloc_init() was called with buf not aligned and len not
     a multiple of POLARSSL_MEMORY_ALIGN_MULTIPLE (not triggerable remotely).
   * User set CFLAGS were ignored by Cmake with gcc (introduced in 1.3.9, found
     by Julian Ospald).
   * Fix potential undefined behaviour in Camellia.
   * Fix potential failure in ECDSA signatures when POLARSSL_ECP_MAX_BITS is a
     multiple of 8 (found by Gergely Budai).
   * Fix unchecked return code in x509_crt_parse_path() on Windows (found by
     Peter Vaskovic).
   * Fix assembly selection for MIPS64 (thanks to James Cowgill).
   * ssl_get_verify_result() now works even if the handshake was aborted due
     to a failed verification (found by Fredrik Axelsson).
   * Skip writing and parsing signature_algorithm extension if none of the
     key exchanges enabled needs certificates. This fixes a possible interop
     issue with some servers when a zero-length extension was sent. (Reported
     by Peter Dettman.)
   * On a 0-length input, base64_encode() did not correctly set output length
     (found by Hendrik van den Boogaard).

Changes
   * Use deterministic nonces for AEAD ciphers in TLS by default (possible to
     switch back to random with POLARSSL_SSL_AEAD_RANDOM_IV in config.h).
   * Blind RSA private operations even when POLARSSL_RSA_NO_CRT is defined.
   * ssl_set_own_cert() now returns an error on key-certificate mismatch.
   * Forbid repeated extensions in X.509 certificates.
   * debug_print_buf() now prints a text view in addition to hexadecimal.
   * A specific error is now returned when there are ciphersuites in common
     but none of them is usable due to external factors such as no certificate
     with a suitable (extended)KeyUsage or curve or no PSK set.
   * It is now possible to disable negotiation of truncated HMAC server-side

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