Log Message:
Update curl to 7.49.1.

Bugfixes:

Windows: prevent DLL hijacking, CVE-2016-4802
dist: include manpage-scan.pl, nroff-scan.pl and CHECKSRC.md
schannel: fix compile break with MSVC XP toolset
curlbuild.h.dist: check __LP64__ as well to fix MIPS build
dist: include curl_multi_socket_all.3
http2: use HTTP/2 in the HTTP/1.1-alike response
openssl: ERR_remove_thread_state() is deprecated in latest 1.1.0
CURLOPT_CONNECT_TO.3: user must not free the list prematurely
libcurl.m4: Avoid obsolete warning
winbuild/Makefile.vc: Fix check on SSL, MBEDTLS, WINSSL exclusivity
curl_multibyte: fix compiler error
openssl: cleanup must free compression methods (memory leak)
mbedtls: fix includes so snprintf() works
checksrc.pl: Added variants of strcat() & strncat() to banned function list
contributors.sh: better grep pattern and show GitHub username
ssh: fix build for libssh2 before 1.2.6
curl_share_setopt.3: Add min ver needed for ssl session lock