nettle: update to 3.5.1.

NEWS for the Nettle 3.5.1 release

	The Nettle-3.5.1 corrects a packaging mistake in Nettle-3.5.
	The new directory x86_64/sha_ni were missing in the tar file,
	breaking x86_64 builds with --enable-fat, and producing worse
	performance than promised for builds with --enable-x86-sha-ni.
	Also a few unused in-progress assembly files were accidentally
	included in the tar file.

	These problems are corrected in Nettle-3.5.1. There are no
	other changes, and also the library version numbers are
	unchanged.

NEWS for the Nettle 3.5 release

	This release adds a couple of new features and optimizations,
	and deletes or deprecates a few obsolete features. It is *not*
	binary (ABI) compatible with earlier versions. Except for
	deprecations listed below, it is intended to be fully
	source-level (API) compatible with Nettle-3.4.1.

	The shared library names are libnettle.so.7.0 and
	libhogweed.so.5.0, with sonames libnettle.so.7 and
	libhogweed.so.5.

	Changes in behavior:

	* Nettle's gcm_crypt will now call the underlying block cipher
	  to process more than one block at a time. This is not a
	  change to the documented behavior, but unfortunately breaks
	  assumptions accidentally made in GnuTLS, up to and including
	  version 3.6.1.

	New features:

	* Support for CFB8 (Cipher Feedback Mode, processing a single
	  octet per block cipher operation), contributed by Dmitry
	  Eremin-Solenikov.

	* Support for CMAC (RFC 4493), contributed by Nikos
	  Mavrogiannopoulos.

	* Support for XTS mode, contributed by Simo Sorce.

	Optimizations:

	* Improved performance of the x86_64 AES implementation using
	  the aesni instructions. Gives a large speedup for operations
	  processing multiple blocks at a time (including CTR mode,
	  GCM mode, and CBC decrypt, but *not* CBC encrypt).

	* Improved performance for CTR mode, for the common case of
	  16-byte block size. Pass more data at a time to underlying
	  block cipher, and fill the counter blocks more efficiently.
	  Extension to also handle GCM mode efficiently contributed
	  by Nikos Mavrogiannopoulos.

	* New x86_64 implementation of sha1 and sha256, for processors
	  supporting the sha_ni instructions. Speedup of 3-5 times on
	  affected processors.

	* Improved parameters for the precomputation of tables used
	  for ecc signatures. Roughly 10%-15% speedup of the ecdsa
	  sign operation using the secp_256r1, secp_384r1 and
	  secp_521r1 curves, and 25% speedup of ed25519 sign
	  operation, benchmarked on x86_64. Table sizes unchanged,
	  around 16 KB per curve.

	* In ARM fat builds, automatically select Neon implementation
	  of Chacha, where possible. Contributed by Yuriy M.
	  Kaminskiy.

	Deleted features:

	* The header file des-compat.h and everything declared therein
	  has been deleted, as announced earlier. This file provided a
	  subset of the old libdes/ssleay/openssl interface for DES
	  and triple-DES. DES is still supported, via the functions
	  declared in des.h.

	* Functions using the old struct aes_ctx have been marked as
	  deprecated. Use the fixed key size interface instead, e.g.,
	  struct aes256_ctx, introduced in Nettle-3.0.

	* The header file nettle-stdint.h, and corresponding autoconf
	  tests, have been deleted. Nettle now requires that the
	  compiler/libc provides <stdint.h>.

	Miscellaneous:

	* Support for big-endian ARM systems, contributed by Michael
	  Weiser.

	* The programs aesdata, desdata, twofishdata, shadata and
	  gcmdata are no longer built by default. Makefile
	  improvements contributed by Jay Foad.

	* The "example" program examples/eratosthenes.c has been
	  deleted.

	* The contents of hash context structs, and the deprecated
	  aes_ctx struct, have been reorganized, to enable later
	  optimizations.

	The shared library names are libnettle.so.7.0 and
	libhogweed.so.5.0.

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