Curl and libcurl 7.57.0

 Public curl releases:         170
 Command line options:         211
 curl_easy_setopt() options:   249
 Public functions in libcurl:  74
 Contributors:                 1618

This release includes the following changes:

 o

This release includes the following bugfixes:

 o ftp: UBsan fixup 'pointer index expression overflowed [1]
 o failf: skip the sprintf() if there are no consumers [2]
 o fuzzer: move to using external curl-fuzzer [3]
 o lib/Makefile.m32: allow customizing dll suffixes [4]
 o docs: fix typo in curl_mime_data_cb man page [5]
 o darwinssl: add support for TLSv1.3 [6]
 o build: fix --disable-crypto-auth [7]
 o lib/config-win32.h: let SMB/SMBS be enabled with OpenSSL/NSS [8]
 o openssl: fix build without HAVE_OPAQUE_EVP_PKEY [9]
 o strtoofft: Remove extraneous null check [10]
 o multi_cleanup: call DONE on handles that never got that [11]
 o tests: added flaky keyword to tests 587 and 644
 o pingpong: return error when trying to send without connection [12]
 o remove_handle: call multi_done() first, then clear dns cache pointer [13]
 o mime: be tolerant about setting twice the same header list in a part.

This release includes the following known bugs:

 o see docs/KNOWN_BUGS (https://curl.haxx.se/docs/knownbugs.html)

This release would not have looked like this without help, code, reports and
advice from friends like these:

  Benbuck Nason, Dan Fandrich, Daniel Stenberg, Felix Kaiser, Javier Sixto,
  Marcel Raad, Max Dymond, Nick Zitzmann, Patrick Monnerat, Viktor Szakáts,
  Wyatt O'Day,
  (11 contributors)

        Thanks! (and sorry if I forgot to mention someone)

References to bug reports and discussions on issues:

 [1] = https://curl.haxx.se/bug/?i=1939
 [2] = https://curl.haxx.se/bug/?i=1936
 [3] = https://curl.haxx.se/bug/?i=1923
 [4] = https://curl.haxx.se/bug/?i=1942
 [5] = https://curl.haxx.se/bug/?i=1946
 [6] = https://curl.haxx.se/bug/?i=1794
 [7] = https://curl.haxx.se/bug/?i=1945
 [8] = https://curl.haxx.se/bug/?i=1943
 [9] = https://curl.haxx.se/bug/?i=1955
 [10] = https://curl.haxx.se/bug/?i=1950
 [11] = https://curl.haxx.se/bug/?i=1954
 [12] = https://curl.haxx.se/bug/?i=1953
 [13] = https://curl.haxx.se/bug/?i=1960

