- Update to 7.53.1
Bugfixes:
* url: Improve CURLOPT_PROXY_CAPATH error handling
* urldata: include curl_sspi.h when Windows SSPI is enabled
* formdata: check for EOF when reading from stdin
* tests: Set CHARSET & LANG to UTF-8 in 1035, 2046 and 2047
* url: Default the proxy CA bundle location to CURL_CA_BUNDLE
* rand: added missing #ifdef HAVE_FCNTL_H around fcntl.h header

- Update to 7.53.0
Changes:
* unix_socket: added --abstract-unix-socket and
CURLOPT_ABSTRACT_UNIX_SOCKET
* CURLOPT_BUFFERSIZE: support enlarging receive buffer
Bugfixes:
* CVE-2017-2629: make SSL_VERIFYSTATUS work again
* gnutls-random: check return code for failed random
* openssl-random: check return code when asking for random
* http: remove "Curl_http_done: called premature" message
* cyassl: use time_t instead of long for timeout
* build-wolfssl: Sync config with wolfSSL 3.10
* ftp-gss: check for init before use
* configure: accept --with-libidn2 instead
* ftp: failure to resolve proxy should return that error code
* curl.1: add three more exit codes
* docs/ciphers: link to our own new page about ciphers
* vtls: s/SSLEAY/OPENSSL - fixes multi_socket timeouts with openssl
* darwinssl: fix iOS build
* darwinssl: fix CFArrayRef leak
* cmake: use crypt32.lib when building with OpenSSL on windows