update of cURL to the current version. Upstream changelog:

Changes:
--------

darwinssl: add TLS session resumption
darwinssl: add TLS crypto authentication
imap/pop3/smtp: Added support for ;auth= in the URL
imap/pop3/smtp: Added support for ;auth= to CURLOPT_USERPWD
usercertinmem.c: add example showing user cert in memory
url: Added smtp and pop3 hostnames to the protocol detection list
imap/pop3/smtp: Added support for enabling the SASL initial response
curl -E: allow to use ':' in certificate nicknames

Bugfixes:
---------

SECURITY VULNERABILITY: curl_easy_unescape() may parse data beyond
    the end of the input buffer [26]
FTP: access files in root dir correctly
configure: try pthread_create without -lpthread
FTP: handle a 230 welcome response
curl-config: don't output static libs when they are disabled
CURL_CHECK_CA_BUNDLE: don't check for paths when cross-compiling
Various documentation updates
getinfo.c: reset timecond when clearing session-info variables
FILE: prevent an artificial timeout event due to stale speed-check data
ftp_state_pasv_resp: connect through proxy also when set by env
sshserver: disable StrictHostKeyChecking
ftpserver: Fixed imap logout confirmation data
curl_easy_init: use less mallocs
smtp: Fixed unknown percentage complete in progress bar
smtp: Fixed sending of double CRLF caused by first in EOB
bindlocal: move brace out of #ifdef
winssl: Fixed invalid memory access during SSL shutdown
OS X framework: fix invalid symbolic link
OpenSSL: allow empty server certificate subject
axtls: prevent memleaks on SSL handshake failures
cookies: only consider full path matches
Revert win32 MemoryTracking: wcsdup() _wcsdup() and _tcsdup()
Curl_cookie_add: handle IPv6 hosts
ossl_send: SSL_write() returning 0 is an error too
ossl_recv: SSL_read() returning 0 is an error too
Digest auth: escape user names with backslash or " in them
curl_formadd.3: fixed wrong "end-marker" syntax
libcurl-tutorial.3: fix incorrect backslash
curl_multi_wait: reduce timeout if the multi handle wants to
tests/Makefile: typo in the perlcheck target
axtls: honor disabled VERIFYHOST
OpenSSL: avoid double free in the PKCS12 certificate code
multi_socket: reduce timeout inaccuracy margin
digest: support auth-int for empty entity body
axtls: now done non-blocking
lib1900: use tutil_tvnow instead of gettimeofday
curl_easy_perform: avoid busy-looping
CURLOPT_COOKIELIST: take cookie share lock
multi_socket: react on socket close immediately

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