Whenever an expected pattern syntax rule cannot be matched, the
character starting the rule loses its special meaning and the parsing
is resumed:
- backslash at the end of pattern string matches itself.
- Error in [:keyword:] results in set containing :\[dekorwy.

Unit test 1307 updated for this new situation.

Closes #2273

Also be more tolerant about set pattern syntax.
Update unit test 1307 accordingly.

Bug: https://curl.haxx.se/mail/lib-2018-01/0114.html

- Fix winbuild and the VS project generator to treat curl_ctype.{c,h} as
  curlx files since they are required by both src and lib.

Follow-up to 4272a0b0 which added curl_ctype.

... since commit 993dd565

Reported-by: Martin Dreher
Bug: https://github.com/curl/curl/pull/2242#issuecomment-361059228

Closes #2271

... instead of doing it unconditionally in debug builds. It cluttered up
the output a little too much.

Closes #2205

Closes #2275

... with the introduction of CURLOPT_TIMEVALUE_LARGE and
CURLINFO_FILETIME_T.

Fixes #2238
Closes #2264

Bug: https://curl.haxx.se/mail/lib-2018-01/0074.html
Reported-by: Ruurd Beerstra
Fixes #2255
Closes #2272

Link.exe requires /DEBUG to properly generate a full pdb file on release
builds.

Closes #2274

To verify a proxy's public key. For when using HTTPS proxies.

Fixes #2192
Closes #2268

The logic tries to figure out what the path separator in the $PATH
variable is, but if there's only one directory in the $PATH it
fails. This change make configure *guess* on colon instead of erroring
out, simply because that is probably the more common character.

PATH_SEPARATOR can always be set by the user to override the guessing.

(tricky bug to reproduce, as in my case for example the configure script
requires binaries in more than one directory so passing in a PATH with a
single dir fails.)

Reported-by: Earnestly on github
Fixes #2202
Closes #2265

... since the libc provided one are locale dependent in a way we don't
want. Also, the "native" isalnum() (for example) works differently on
different platforms which caused test 1307 failures on macos only.

Closes #2269

Previously, they were opened with Visual Studio 2015 by default, which
cannot build them.

Closes #1888

Closes #1809

Closes https://github.com/curl/curl/pull/2266

If CURL_DOES_CONVERSION is enabled, uploaded LFs are mapped to CRLFs,
giving a result that is different from what is expected.
This commit avoids using CURLOPT_TRANSFERTEXT and directly encodes data
to upload in ascii.

Bug: https://github.com/curl/curl/pull/1872

... with clang on macos

Data mismatch caused test 545 to fail when character encoding
conversion is enabled.

Bug: https://github.com/curl/curl/pull/1872

inadvertently removed in 283babfa

Closes #2263

Closes #2085

Assign the time_t variable negative value and then check if it is
greater than zero, which will evaluate true for unsigned time_t but
false for signed time_t.

Make curl_getdate() handle dates before 1970 as well (returning negative
values).

Make test 517 test dates for 64 bit time_t.

This fixes bug (3) mentioned in #2238

Closes #2250

Here is a version that should work with all versions of openssl 0.9.7
through 1.1.0.

Links to the docs:
https://www.openssl.org/docs/man1.0.2/crypto/EVP_DigestInit.html
https://www.openssl.org/docs/man1.1.0/crypto/EVP_DigestInit.html

At the very bottom of the 1.1.0 documentation there is a history section
that states, " stack allocated EVP_MD_CTXs are no longer supported."

If EVP_MD_CTX_create and EVP_MD_CTX_destroy are not defined, then a
simple mapping can be used as described here:
https://wiki.openssl.org/index.php/Talk:OpenSSL_1.1.0_Changes

Closes #2258

Closes #1429

It was once used for some debugging/verifying logic but should never have
ended up in git!

An idea that popped up in discussions on twitter.

Reported-By: Gisle Vanem
Bug: https://github.com/curl/curl/commit/993dd5651a6c853bfe3870f6a69c7b329fa4e8ce#commitcomment-27070080

djgpp do have 'mkdir(dir, mode)'. Other DOS-compilers does not 
But djgpp seems the only choice for MSDOS anyway.

PellesC do have a 'F_OK' defined in it's <unistd.h>.

Update year in Copyright.