curl: update to 7.56.1

Curl and libcurl 7.56.1

This release includes the following bugfixes:

 o imap: if a FETCH response has no size, don't call write callback
 o ftp: UBsan fixup 'pointer index expression overflowed
 o failf: skip the sprintf() if there are no consumers
 o fuzzer: move to using external curl-fuzzer
 o lib/Makefile.m32: allow customizing dll suffixes
 o docs: fix typo in curl_mime_data_cb man page
 o darwinssl: add support for TLSv1.3
 o build: fix --disable-crypto-auth
 o lib/config-win32.h: let SMB/SMBS be enabled with OpenSSL/NSS
 o openssl: fix build without HAVE_OPAQUE_EVP_PKEY
 o strtoofft: Remove extraneous null check
 o multi_cleanup: call DONE on handles that never got that
 o tests: added flaky keyword to tests 587 and 644
 o pingpong: return error when trying to send without connection
 o remove_handle: call multi_done() first, then clear dns cache pointer
 o mime: be tolerant about setting twice the same header list in a part.
 o mime: improve unbinding top multipart from easy handle.
 o mime: avoid resetting a part's encoder when part's contents change.
 o mime: refuse to add subparts to one of their own descendants
 o RTSP: avoid integer overflow on funny RTSP responses
 o curl: don't pass semicolons when parsing Content-Disposition
 o openssl: enable PKCS12 support for !BoringSSL
 o FAQ: s/CURLOPT_PROGRESSFUNCTION/CURLOPT_XFERINFOFUNCTION
 o CURLOPT_NOPROGRESS.3: also refer to xferinfofunction
 o CURLOPT_XFERINFODATA.3: fix duplicate see also
 o test298: verify --ftp-method nowcwd with URL encoded path
 o FTP: URL decode path for dir listing in nocwd mode
 o smtp_done: fix memory leak on send failure
 o ftpserver: support case insensitive commands
 o test950; verify SMTP with custom request
 o openssl: don't use old BORINGSSL_YYYYMM macros
 o setopt: update current connection SSL verify params
 o winbuild/BUILD.WINDOWS.txt: mention WITH_NGHTTP2
 o curl: reimplement stdin buffering in -F option
 o mime: keep "text/plain" content type if user-specified
 o mime: fix the content reader to handle >16K data properly
 o configure: remove the C++ compiler check
 o memdebug: trace send, recv and socket
 o runtests: use valgrind for torture as well
 o ldap: silence clang warning
 o makefile.m32: allow to override gcc, ar and ranlib
 o setopt: avoid integer overflows when setting millsecond values
 o setopt: range check most long options
 o ftp: reject illegal IP/port in PASV 227 response
 o mime: do not reuse previously computed multipart size
 o vtls: change struct Curl_ssl `close' field name to `close_one'
 o os400: add missing symbols in config file
 o mime: limit bas64-encoded lines length to 76 characters
 o mk-ca-bundle: Remove URL for aurora
 o mk-ca-bundle: Fix URL for NSS

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