SSLeay was the name of the library that was subsequently turned into
OpenSSL many moons ago (1999). curl does not work with the old SSLeay
library since years. This is now reflected by only using USE_OPENSSL in
code that depends on OpenSSL.

Acked-by: Brad King

... which otherwise made the script skip the _LAST define for some
symbols.

Reported-by: Jeroen Ooms
Bug: http://curl.haxx.se/mail/lib-2015-03/0052.html

Reported-by: Jon Seymour

No need to use _MPRINTF_REPLACE internally.

Bug: https://github.com/bagder/curl/pull/144

... and as a consequence, introduce curl_printf.h with that re-define
magic instead and make all libcurl code use that instead.

And UTF8-fix a few names

Reported-by: Jonathan Cardoso

Reporte-by: Steve Havelka

... to avoid a build failure when configured with --enable-debug

Previously, we just ignored error code passed to
on_stream_close_callback and just return 0 (success) after stream
closure even if stream was reset with error.  This patch records error
code in on_stream_close_callback, and return -1 and use CURLE_HTTP2
error code on abnormal stream closure.

As the 'error' and 'mute' options are now part of the GlobalConfig,
rather than per Operation, updated the warnf() function to use this
structure rather than the OperationConfig.

Removed the DataExecutionPrevention directive from the project files for
Visual Studio 2008 and above. The XML value in the VC9 project files was
set to "0" (Default) whilst the VC10+ project files contained an empty
XML element.

Visual Studio 2008 introduced support for the address space layout
randomization (ASLR) feature of Windows Vista. However, upgrading the
VC8 project files to VC9 and above disabled this feature.

Removed the RandomizedBaseAddress directive to enabled the default
setting (/DYNAMICBASE). Note: This doesn't appear to have any negative
impact when compiled and ran on Windows XP.

Pointed-out-by: Tatsuhiro Tsujikawa
Bug: http://curl.haxx.se/bug/view.cgi?id=1487

... in order to make test1135 succeed

Otherwise it expands to:

    echo ""/etc/pki/tls/certs/ca-bundle.crt""

Detected by ShellCheck:

    curl-config:74:16: warning: The double quotes around this do
    nothing.  Remove or escape them. [SC2140]

In that case, we only skip writing the error message for failed NSS
initialization (while still returning the correct error code).

The vtls layer now checks the return value, so it is no longer necessary
to abort if a random number cannot be provided by NSS.  This also fixes
the following Coverity report:

Error: FORWARD_NULL (CWE-476):
lib/vtls/nss.c:1918: var_compare_op: Comparing "data" to null implies that "data" might be null.
lib/vtls/nss.c:1923: var_deref_model: Passing null pointer "data" to "Curl_failf", which dereferences it.
lib/sendf.c:154:3: deref_parm: Directly dereferencing parameter "data".

... and remove some old ones

This reverts commit 03fa5768.

obj_count can be 1 if the custom read function is set or the stdin
handle is a reference to a pipe. Since the pipe should be handled
using the PeekNamedPipe-check below, the custom read function should
only be used if it is actually enabled.

According to [1]: "Returning 0 will signal end-of-file to the library
and cause it to stop the current transfer."
This change makes the Windows telnet code handle this case accordingly.

 [1] http://curl.haxx.se/libcurl/c/CURLOPT_READFUNCTION.html