Prior to this change CyaSSL's build options could redefine some generic
build symbols.

http://curl.haxx.se/mail/lib-2015-04/0069.html

Bug: https://github.com/bagder/curl/pull/171

When a config file line ends without newline, the parsing function could
continue reading beyond that point in memory.

Reported-by: Hanno Böck

At some point, Firefox has changed and generates different directory
names for the default profile that made this script fail to find them.

Bug: https://github.com/bagder/curl/issues/207
Reported-by: sneakyimp

CyaSSL >= 2.6.0 may have an options.h that was generated during
its build by configure.

Prior to this change Visual Studio builds could fail due to missing
prerequisites src/tool_hugehelp.c and include/curl/curlbuild.h.

http://curl.haxx.se/mail/lib-2015-04/0034.html

Add 'gdi32' and 'crypt32' Windows implibs to avoid failure
while building libcurl.dll using the mingw compiler.
The same logic is used in 'src/makefile.m32' when
building curl.exe.

... of an empty file

Bug: https://github.com/bagder/curl/issues/183

The factor of 8 is a bytes-to-bits conversion factor, but pkt_size and
rate_bps are both in bytes. When using the rate limiting option, curl
waits 8 times too long, and then transfers very quickly until the
average rate reaches the limit. The average rate follows the limit over
time, but the actual traffic is bursty.

Thanks-to: Benjamin Gilbert

The key length in bits will always fit in an unsigned long so the
loss-of-data warning assigning the result of x64 pointer arithmetic to
an unsigned long is unnecessary.

Also fix it so that all ERR_error_string calls use an error buffer.
CyaSSL's implementation of ERR_error_string only writes the error when
an error buffer is passed.

http://www.yassl.com/forums/topic599-openssl-compatibility-and-errerrorstring.html

Prior to this change libcurl could show multiple 'CyaSSL: Connecting to'
messages since cyassl_connect_step2 is called multiple times, typically.
The message is superfluous even once since libcurl already informs the
user elsewhere in code that it is connecting.

introduced in the previous mini-series of 3 commits

- also log when a CURLOPT_RESOLVE entry couldn't get parsed

- cache entries must be also refreshed when they are in use
- have the cache count as inuse reference too, freeing timestamp == 0 special
  value
- use timestamp == 0 for CURLOPT_RESOLVE entries which don't get refreshed
- remove CURLOPT_RESOLVE special inuse reference (timestamp == 0 will prevent refresh)
- fix Curl_hostcache_clean - CURLOPT_RESOLVE entries don't have a special
  reference anymore, and it would also release non CURLOPT_RESOLVE references
- fix locking in Curl_hostcache_clean
- fix unit1305.c: hash now keeps a reference, need to set inuse = 1

This change is to allow the user's CTX callback to change the minimum
protocol version in the CTX without us later overriding it, as we did
prior to this change.

Use LF not CRLF, throughout.  msysgit will only convert a file to CRLF
on checkout if it's not mixed.

SSL_CTX_load_verify_locations can return negative values on fail,
therefore to check for failure we check if load is != 1 (success)
instead of if load is == 0 (failure), the latter being incorrect given
that behavior.

Previously in Curl_http2_switched, we called nghttp2_session_mem_recv to
parse incoming data which were already received while curl was handling
upgrade.  But we didn't call nghttp2_session_send, and it led to make
curl not send any response to the received frames.  Most likely, we
received SETTINGS from server at this point, so we missed opportunity to
send SETTINGS + ACK.  This commit adds missing nghttp2_session_send call
in Curl_http2_switched to fix this issue.

Bug: https://github.com/bagder/curl/issues/192
Reported-by: Stefan Eissing