Log Message:
Updated curl to 7.53.0.

Curl and libcurl 7.53.0

This release includes the following changes:

 o unix_socket: added --abstract-unix-socket and CURLOPT_ABSTRACT_UNIX_SOCKET [25]
 o CURLOPT_BUFFERSIZE: support enlarging receive buffer [29]

This release includes the following bugfixes:

 o CVE-2017-2629: make SSL_VERIFYSTATUS work again [64]
 o gnutls-random: check return code for failed random
 o openssl-random: check return code when asking for random
 o http: remove "Curl_http_done: called premature" message
 o cyassl: use time_t instead of long for timeout
 o build-wolfssl: Sync config with wolfSSL 3.10
 o ftp-gss: check for init before use
 o configure: accept --with-libidn2 instead [1]
 o ftp: failure to resolve proxy should return that error code
 o curl.1: add three more exit codes
 o docs/ciphers: link to our own new page about ciphers
 o vtls: s/SSLEAY/OPENSSL - fixes multi_socket timeouts with openssl [2]
 o darwinssl: fix iOS build [3]
 o darwinssl: fix CFArrayRef leak [4]
 o cmake: use crypt32.lib when building with OpenSSL on windows [5]
 o curl_formadd.3: CURLFORM_CONTENTSLENGTH not needed when chunked [6]
 o digest_sspi: copy terminating NUL as well [7]
 o curl: fix --remote-time incorrect times on Windows [8]
 o curl.1: several updates and corrections [11]
 o content_encoding: change return code on a failure
 o curl.h: CURLE_FUNCTION_NOT_FOUND is no longer in use
 o docs: TCP_KEEPALIVE start and interval default to 60 [9]
 o darwinssl: --insecure overrides --cacert if both settings are in use [10]
 o TheArtOfHttpScripting: grammar
 o CIPHERS.md: document GSKit ciphers
 o wolfssl: support setting cipher list
 o wolfssl: display negotiated SSL version and cipher
 o lib506: fix build for Open Watcom [12]
 o asiohiper: improved socket handling [13]
 o examples: make the C++ examples follow our code style too
 o tests/sws: retry send() on EWOULDBLOCK [14]
 o cmake: Fix passing _WINSOCKAPI_ macro to compiler [15]
 o smtp: Fix STARTTLS denied error message
 o imap/pop3: don't print response character in STARTTLS denied messages [16]
 o rand: make it work without TLS backing [17]
 o url: fix parsing for when 'file' is the default protocol [18]
 o url: allow file://X:/path URLs on windows again [19]
 o gnutls: check for alpn and ocsp in configure [20]
 o IDN: Use TR46 'non-transitional' for toASCII translations [21]
 o url: Fix NO_PROXY env var to work properly with --proxy option [22]
 o CURLOPT_PREQUOTE.3: takes a struct curl_slist*, not a char* [23]
 o docs: Add note about libcurl copying strings to CURLOPT_* manpages [24]
 o curl: reset the easy handle at --next
 o --next docs: --trace and --trace-ascii are also global
 o --write-out docs: 'time_total' is not always shown with ms precision
 o http: print correct HTTP string in verbose output when using HTTP/2
 o docs: improved language in README.md HISTORY.md CONTRIBUTE.md [26]
 o http2: disable server push if not requested [27]
 o nss: use the correct lock in nss_find_slot_by_name()
 o usercertinmem.c: improve the short description
 o CURLOPT_CONNECT_TO: Fix compile warnings
 o docs: non-blocking SSL handshake is now supported with NSS
 o *.rc: escape non-ASCII/non-UTF-8 character for clarity [28]
 o mbedTLS: fix multi interface non-blocking handshake [30]
 o PolarSSL: fix multi interface non-blocking handshake [31]
 o VC: remove the makefile.vc6 build infra [32]
 o telnet: fix windows compiler warnings [33]
 o cookies: do not assume a valid domain has a dot
 o polarssl: fix hangs
 o gnutls: disable TLS session tickets [34]
 o mbedtls: disable TLS session tickets [35]
 o mbedtls: implement CTR-DRBG and HAVEGE random generators [36]
 o openssl: Don't use certificate after transferring ownership [37]
 o cmake: Support curl --xattr when built with cmake [38]
 o OS400: Fix symbols [39]
 o docs: Add more HTTPS proxy documentation [40]
 o docs: use more HTTPS links [41]
 o cmdline-opts: Fixed build and test in out of source tree builds
 o CHANGES.0: removed
 o schannel: Remove incorrect SNI disabled message [42]
 o darwinssl: Avoid parsing certificates when not in verbose mode [43]
 o test552: Fix typos [44]
 o telnet: Fix typos [45]
 o transfer: only retry nobody-requests for HTTP [46]
 o http2: reset push header counter fixes crash [47]
 o nss: make FTPS work with --proxytunnel [48]
 o test1139: Added the --manual keyword since the manual is required
 o polarssl, mbedtls: Fix detection of pending data [49]
 o http_proxy: Fix tiny memory leak upon edge case connecting to proxy [50]
 o URL: only accept ";options" in SMTP/POP3/IMAP URL schemes [51]
 o curl.1: ftp.sunet.se is no longer an FTP mirror
 o tool_operate: Show HTTPS-Proxy options on CURLE_SSL_CACERT [52]
 o http2: fix memory-leak when denying push streams [53]
 o configure: Allow disabling pthreads, fall back on Win32 threads [54]
 o curl: fix typo in time condition warning message [55]
 o axtls: adapt to API changes [56]
 o tool_urlglob: Allow a glob range with the same start and stop [57]
 o winbuild: add note on auto-detection of MACHINE in Makefile.vc [58]
 o http: fix missing 'Content-Length: 0' while negotiating auth [59]
 o proxy: fix hostname resolution and IDN conversion [60]
 o docs: fix timeout handling in multi-uv example
 o digest_sspi: Fix nonce-count generation in HTTP digest [61]
 o sftp: improved checks for create dir failures [62]
 o smb: use getpid replacement for windows UWP builds [63]
 o digest_sspi: Handle 'stale=TRUE' directive in HTTP digest [65]