Regression introduced in 09b5a998

Bug: https://curl.haxx.se/mail/lib-2016-04/0084.html
Reported-by: BoBo

follow-up commit to 3c1e84f5 as it made curl try a little harder

If buffer is allocated, but nothing is received during prereceive
stage, than number of processed bytes must be zero.

Closes #778

Closes #686 for now.

Adding support for IRIs is a mouthful, but is probably interesting at
least for areas and countries where the use of such "URLs" are growing
popularity.

Closes #776

It got too annoying to type =)

The underlying libcurl option used for this feature is
CURLOPT_FTP_CREATE_MISSING_DIRS which has the ability to retry the dir
creation, but it was never set to do that by the command line tool.

Now it does.

Bug: https://curl.haxx.se/mail/archive-2016-04/0021.html
Reported-by: John Wanghui
Help-by: Leif W

Add WITH_MBEDTLS option. Make WITH_SSL, WITH_MBEDTLS and ENABLE_WINSSL
options mutual exclusive.

Closes #606

As of commit d9f3b365

These configure vars are modified in a curl-specific way but never
evaluated or loaded from cache, even though they are designated as
_cv_. We could either implement proper AC_CACHE_CHECKs for them, or
remove them completely.

Fixes #603 as ac_cv_func_gethostbyname is no longer clobbered, and
AC_CHECK_FUNC(gethostbyname...) will no longer spuriously succeed after
the first configure run with caching.

`ac_cv_func_strcasecmp` is curious, see #770.

`eval "ac_cv_func_$func=yes"` can still cause problems as it works in
tandem with AC_CHECK_FUNCS and then potentially modifies its result. It
would be best to rewrite this test to use a new CURL_CHECK_FUNCS macro,
which works the same as AC_CHECK_FUNCS but relies on caching the values
of curl_cv_func_* variables, without modifiying ac_cv_func_*.

These configure vars are modified in a curl-specific way and modified by
the configure process, but are never loaded from cache, even though they
are designated as _cv_. We should implement proper AC_CACHE_CHECKs for
them eventually.

This variable must not be cached in its current form, as any cached
information will prevent the next configure run from determining the
correct LIBS needed for the function. Thus, rename prefix `ac_cv_` to
just `curl_`.

This was automated by:

sed -b -i -f <(ack -A1 AC_CACHE_CHECK | \
               ack -o 'ac_cv_.*?\b' | \
               sort -u | xargs -n1 bash -c \
                    'echo "s/$0/curl_cv_${0#ac_cv_}/g"') \
    $(git ls-files)

This only changed the prefix for 16 variables actually checked with
AC_CACHE_CHECK.

The RSA, DSA and DH structs are now opaque and require use of new APIs

Fixes #763

Fixed commit fa5fa65a to not use NULLs in if condition.

At ConnectionExists, both check->proxyuser and check->proxypasswd
could be NULL, so make sure to check first.

Fixes #765

... for checking ability to receive full HTTP response when POST request
is used with slow read callback function.

This test checks for bug #657 and verifies the work-around from
72d5e144.

Closes #720

WinSock destroys recv() buffer if send() is failed. As result - server
response may be lost if server sent it while curl is still sending
request. This behavior noticeable on HTTP server short replies if
libcurl use several send() for request (usually for POST request).
To workaround this problem, libcurl use recv() before every send() and
keeps received data in intermediate buffer for further processing.

Fixes: #657
Closes: #668

This commit fixes a Clang warning introduced in curl-7_48_0-190-g8f72b13:

Error: CLANG_WARNING:
lib/connect.c:1120:11: warning: The right operand of '==' is a garbage value
1118|       }
1119|
1120|->     if(-1 == rc)
1121|         error = SOCKERRNO;
1122|     }

... as checksrc now skips comments

... that the new checksrc detected

... since checksrc now skips comments

... but output non-stripped version of the line, even if that then can
make the script identify the wrong position in the line at
times. Showing the line stripped (ie without comments) is just too
surprising.

... to make it easier to add lines in patches that won't just break all
other patches trying to add lines too.

(since we just merged two major features)

Closes #660