This uses the brotli external library (https://github.com/google/brotli).
Brotli becomes a feature: additional curl_version_info() bit and
structure fields are provided for it and CURLVERSION_NOW bumped.

Tests 314 and 315 check Brotli content unencoding with correct and
erroneous data.

Some tests are updated to accomodate with the now configuration dependent
parameters of the Accept-Encoding header.

This is implemented as an output streaming stack of unencoders, the last
calling the client write procedure.

New test 230 checks this feature.

Bug: https://github.com/curl/curl/pull/2002
Reported-By: Daniel Bankhead

Since CURLSSH_AUTH_ANY (aka CURLSSH_AUTH_DEFAULT) is ~0 an arg value
check on this option is incorrect; we have to accept any value.

Prior to this change since f121575c (7.56.1+) CURLOPT_SSH_AUTH_TYPES
erroneously rejected CURLSSH_AUTH_ANY with CURLE_BAD_FUNCTION_ARGUMENT.

Bug: https://github.com/curl/curl/commit/f121575#commitcomment-25347120

It triggers an assert() when built with memdebug since malloc(0) may
return NULL *or* a valid pointer.

Detected by OSS-Fuzz: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=4054

Assisted-by: Max Dymond
Closes #2054

By properly keeping track of the last entry in the list of URLs/uploads
to handle, curl now avoids many meaningless traverses of the list which
speeds up many-URL handling *MASSIVELY* (several magnitudes on 100K
URLs).

Added test 1291, to verify that it doesn't take ages - but we don't have
any detection of "too slow" command in the test suite.

Reported-by: arainchik on github
Fixes #1959
Closes #2052

Assisted-by: Per Lundberg
Fixes #2044
Closes #2046
Closes #2048

Regression since f121575c

Reported-by: Petr Voytsik
Fixes #2047

Prior to this change since f121575c (7.56.1+) CURLOPT_DNS_CACHE_TIMEOUT
erroneously rejected -1 with CURLE_BAD_FUNCTION_ARGUMENT.

This caused the torture tests on test 1800 to fail.

Test cleanup after OOM wasn't being consistently performed.

... which is valid according to documentation. Regression since
f121575c.

Verified now in test 501.

Reported-by: cbartl on github
Fixes #2038
Closes #2039

.. also add same arg value check to CURLOPT_POSTFIELDSIZE_LARGE.

Prior to this change since f121575c (7.56.1+) CURLOPT_POSTFIELDSIZE
erroneously rejected -1 value with CURLE_BAD_FUNCTION_ARGUMENT.

Bug: https://curl.haxx.se/mail/lib-2017-11/0000.html
Reported-by: Andrew Lambert

... when expiring old cookies.

Reported-by: Pavel Gushchin
Fixes #2032
Closes #2035

This avoids build errors and warnings caused by implicit casts.

Closes https://github.com/curl/curl/pull/2031

Do not generate line with the current date, such as:

* Generation time: Tue Oct-24 18:01:41 2017

This will improve reproducibility. The generated string is only
part of a comment, so there should be no adverse consequences.

Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>

closes #2026

Pointed-out-by: Dmitri Tikhonov
Bug: #2034

s/curlx_tvnow/Curl_now

If clock_gettime() is not supported, use mach_absolute_time() on MacOS.

closes #2033

Also upgrade test 1133 to cover this case and clarify man page about
form data quoting.

Bug: https://github.com/curl/curl/issues/2022
Reported-By: omau on github

The config files define curl and libcurl targets as imported targets
CURL::curl and CURL::libcurl. For backward compatibility with CMake-
provided find-module the CURL_INCLUDE_DIRS and CURL_LIBRARIES are
also set.

Closes #1879

Updated docs to include support for RFC7616

Signed-off-by: Florin <petriuc.florin@gmail.com>

Closes #1934

Signed-off-by: Florin <petriuc.florin@gmail.com>

Closes #2002

Removed done stuff. Removed entries no longer considered for the near
term.

Closes #2028

returning 'time_t' is problematic when that type is unsigned and we
return values less than zero to signal "already expired", used in
several places in the code.

Closes #2021

Regression since f121575c

Reported-by: Rob Cotrone

This avoids warnings about unused stuff.

Closes https://github.com/curl/curl/pull/2023

"PR-welcome" was the former name.