To make builds with VS2015 work. Recent changes in VS2015 _IOB_ENTRIES
handling is causing problems. This fix changes the OpenSSL backend code
to use BIO functions instead of FILE I/O functions to circumvent those
problems.

Closes #2512

Assisted-by: Dan Fandrich

Closes #2528

This file wasn't included in commit 4af40b36 which updated all
haxx.se http urls to https. The file was committed prior to that update,
but may have been merged after it and hence didn't get updated.

Closes #2550

follow-up to e66cca04

... instead of previous separate struct fields, to make it easier to
extend and change individual backends without having to modify them all.

closes #2547

Curl_setup_transfer() can be called to setup a new individual transfer
over a multiplexed connection so it shouldn't unset writesockfd.

Bug: #2520
Closes #2549

They are removed from the compiler flags.

This ensures that make dependency tracking will force a rebuild whenever
configure --enable-debug or --enable-curldebug changes.

Closes #2548

It triggers an assert.

Detected by OSS-Fuzz
Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=8144
Closes #2546

Closes #2531

When only building with SSL backends that don't use the CA bundle file
(by default), skip the check.

Fixes #2543
Fixes #2180
Closes #2545

ssh-libssh.c:2429:21: warning: result of '1 << 31' requires 33 bits to
represent, but 'int' only has 32 bits [-Wshift-overflow=]

'len' will never be that big anyway so I converted the run-time check to
a regular assert.

Commit 3c630f9b partially reverted the
changes from commit dd7521bc because of
the problem that strcpy_url() was modified unilaterally without also
modifying strlen_url(). As a consequence strcpy_url() was again
depending on ASCII encoding.

This change fixes strlen_url() and strcpy_url() in parallel to use a
common host-encoding independent criterion for deciding whether an URL
character must be %-escaped.

Closes #2535

Closes #2544

This reverts commit d5d683a9.

--disable-pthreads can be used to disable pthreads and get the threaded
resolver to use the windows threading when building with mingw.

... as it defines it (too)

Closes https://github.com/curl/curl/pull/2542

Feedback-by: Michael Kilburn

Closes #1411

Closes #1508

Closes #2051

Closes #1332

It seems to not be detected by default anymore (which is a bug I
believe)

Closes #2541

Closes #2299

Closes #2252

... and make test 1026 rely on that feature so that --disable-manual
builds don't cause test failures.

Reported-by: Max Dymond and Anders Roxell
Fixes #2533
Closes #2540

Commit 2bc230de made the macro MAX_COOKIE_LINE_TXT become unused,
so remove as it's not part of the published API.

Closes https://github.com/curl/curl/pull/2537

This extends the INDENTATION case to also handle 'else' statements
and require proper indentation on the following line. Also fixes the
offending cases found in the codebase.

Closes #2532

This function can get called on a connection that isn't setup enough to
have the 'recv_underlying' function pointer initialized so it would try
to call the NULL pointer.

Reported-by: Dario Weisser

Follow-up to db1b2c7f (never shipped in a release)
Closes #2536

Follow-up to 1514c446: replace another strstr() call done on a
buffer that might not be zero terminated - with a memchr() call, even if
we know the substring will be found.

Assisted-by: Max Dymond

Detected by OSS-Fuzz
Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=8021

Closes #2534

WolfSSL doesn't enable it by default anymore

All occurrences of assignment within conditional expression in
os400sys.c rewritten into two steps: first assignment and then the check
on the success of the assignment. Also adjust related incorrect brace
positions to match project indentation style.

This was spurred by seeing "if((inp = input_token))", but while in there
all warnings were fixed.

There should be no functional change from these changes.

Closes #2525

The jar should be written iff there are cookies, so ensure that we still
have cookies after expiration to avoid creating an empty file.

Closes #2529