curl: update to 7.57.0.

Curl and libcurl 7.57.0

o auth: add support for RFC7616 - HTTP Digest access authentication [12]
o share: add support for sharing the connection cache [31]
o HTTP: implement Brotli content encoding [28]

This release includes the following bugfixes:

o CVE-2017-8816: NTLM buffer overflow via integer overflow [47]
o CVE-2017-8817: FTP wildcard out of bounds read [48]
o CVE-2017-8818: SSL out of buffer access [49]
o curl_mime_filedata.3: fix typos [1]
o libtest: Add required test libraries for lib1552 and lib1553 [2]
o fix time diffs for systems using unsigned time_t [3]
o ftplistparser: memory leak fix: free temporary memory always [4]
o multi: allow table handle sizes to be overridden [5]
o wildcards: don't use with non-supported protocols [6]
o curl_fnmatch: return error on illegal wildcard pattern [7]
o transfer: Fix chunked-encoding upload too early exit [8]
o curl_setup: Improve detection of CURL_WINDOWS_APP [9]
o resolvers: only include anything if needed [10]
o setopt: fix CURLOPT_SSH_AUTH_TYPES option read
o appveyor: add a win32 build
o Curl_timeleft: change return type to timediff_t [11]
o cmake: Export libcurl and curl targets to use by other cmake projects [13]
o curl: in -F option arg, comma is a delimiter for files only [14]
o curl: improved ";type=" handling in -F option arguments
o timeval: use mach_absolute_time() on MacOS [15]
o curlx: the timeval functions are no longer provided as curlx_* [16]
o mkhelp.pl: do not generate comment with current date [17]
o memdebug: use send/recv signature for curl_dosend/curl_dorecv [18]
o cookie: avoid NULL dereference [19]
o url: fix CURLOPT_POSTFIELDSIZE arg value check to allow -1 [20]
o include: remove conncache.h inclusion from where its not needed
o CURLOPT_MAXREDIRS: allow -1 as a value [21]
o tests: Fixed torture tests on tests 556 and 650
o http2: Fixed OOM handling in upgrade request
o url: fix CURLOPT_DNS_CACHE_TIMEOUT arg value check to allow -1
o CURLOPT_INFILESIZE: accept -1 [22]
o curl: pass through [] in URLs instead of calling globbing error [23]
o curl: speed up handling of many URLs [24]
o ntlm: avoid malloc(0) for zero length passwords [25]
o url: remove faulty arg value check from CURLOPT_SSH_AUTH_TYPES [26]
o HTTP: support multiple Content-Encodings [27]
o travis: add a job with brotli enabled
o url: remove unncessary NULL-check
o fnmatch: remove dead code
o connect: store IPv6 connection status after valid connection [29]
o imap: deal with commands case insensitively [30]
o --interface: add support for Linux VRF [32]
o content_encoding: fix inflate_stream for no bytes available [33]
o cmake: Correctly include curl.rc in Windows builds [34]
o cmake: Add missing setmode check [35]
o connect.c: remove executable bit on file [36]
o SMB: fix uninitialized local variable
o zlib/brotli: only include header files in modules needing them [37]
o URL: return error on malformed URLs with junk after IPv6 bracket [38]
o openssl: fix too broad use of HAVE_OPAQUE_EVP_PKEY [39]
o macOS: Fix missing connectx function with Xcode version older than 9.0 [40]
o --resolve: allow IP address within [] brackets [41]
o examples/curlx: Fix code style [42]
o ntlm: remove unnecessary NULL-check to please scan-build [43]
o Curl_llist_remove: fix potential NULL pointer deref [43]
o mime: fix "Value stored to 'sz' is never read" scan-build error [43]
o openssl: fix "Value stored to 'rc' is never read" scan-build error [43]
o http2: fix "Value stored to 'hdbuf' is never read" scan-build error [43]
o http2: fix "Value stored to 'end' is never read" scan-build error [43]
o Curl_open: fix OOM return error correctly [43]
o url: reject ASCII control characters and space in host names [44]
o examples/rtsp: clear RANGE again after use [45]
o connect: improve the bind error message [46]
o make: fix "make distclean" [50]
o connect: add support for new TCP Fast Open API on Linux [51]
o metalink: fix memory-leak and NULL pointer dereference [52]
o URL: update "file:" URL handling [53]
o ssh: remove check for a NULL pointer [54]
o global_init: ignore CURL_GLOBAL_SSL's absense [55]

(wiz)