Repaired all curl/lib/checksrc.pl warnings in the previous four patches

Added WIN32 threading support for PolarSSL entropy if
--enable-threaded-resolver config flag is set and process.h can be found.

Added pthread support for polarssl entropy if --enable-threaded-resolver
config flag is set and pthread.h can be found.

Add non-threaded entropy and ctr_drbg and removed HAVEGE_RANDOM define

Print out human readable error strings for PolarSSL related errors

Since the function takes no argument, the macro shouldn't take one as
some compilers will error out on that.

... since they're not used by the easy interface really, I wanted to
remove the association. Also, I unified the pingpong statemachine driver
into a single function with a 'wait' argument: Curl_pp_statemach.

Remove tailing whitespace introduced in commit 7ed689d2.

A call to Curl_ssl_connect() was accidentally left in when the SSL/TLS
connection layer was reworked in 7.29. Not only would this cause the
connection to block but had the additional overhead of calling the
non-blocking connect a little bit later.

Renamed smtp_state_auth_resp() function to match the implementations in
IMAP and POP3.

Clarify the code by reducing ifdefs

This function was only used twice, both in places where performance
isn't crucial (socks + if2ip). Removing the use of this function removes
the need to have our private version for systems without it == reduced
amount of code.

Also, in the SOCKS case it is clearly better to fail gracefully rather
than to truncate the results.

This work was triggered by a bug report on the strcal prototype in
strequal.h.

strlcat was added in commit db70cd28 in February 2001!

Bug: http://curl.haxx.se/bug/view.cgi?id=1192
Reported by: Jeremy Huddleston

As Curl_FormBoundary() is no longer used outside of this file (since
commit ad7291c1), it is now renamed to formboundary() and is made
static.

Instead of just abusing the pseudo-randomizer from Curl_FormBoundary(),
this now uses Curl_ossl_random() to get entropy.

Replaced two explicit comparisons of CURLE_OK with boolean alternatives.

General tidy up of comments.

The smtp_connect() function was setting the member variables of the
pingpong structure twice, once before calling Curl_pp_init() and once
after!

Use 'vs' directory tree given that 'vc' intended one clashes
with an already existing build target in file Makefile.dist.

Version 7.29.0 uses Makefiles generated with a newer version of the
autotools than the previous 7.28.1. These Makefiles try to install
e.g. header files by calling install-sh with multiple source files as
arguments. The bundled install-sh is to old and does not support this.

The problem only occurs, if install-sh is actually being used, ie. the
platform install executable is to old or not usable. Example: Solaris
10.

The files install-sh and mkinstalldirs are now updated with the automake
1.11.3 versions. A better fix might be to completely remove them from
git and force the files to be added/created during buildconf.

Bug: http://curl.haxx.se/bug/view.cgi?id=1195
Reported by: Rainer Jung

Fixed a small whitespace issue that crept in there in commit
508cdf4d.

Fixed a null pointer reference when an empty challenge is passed to the
Curl_sasl_create_digest_md5_message() function.

Bug: http://sourceforge.net/p/curl/bugs/1193/
Reported by: Saran Neti

Removed unnecessary end of line check and return.

An ambiguity in the SSLWrite() documentation lead to a bad inference in the
code where we assumed SSLWrite() returned the amount of bytes written to
the socket, when that is not actually true; it returns the amount of data
that is buffered for writing to the socket if it returns errSSLWouldBlock.
Now darwinssl_send() returns CURLE_AGAIN if data is buffered but not written.

Reference URL: http://curl.haxx.se/mail/lib-2013-02/0145.html

Reworked the pp->endofresp() function so that the conndata, line and
line length are passed down to it just as with Curl_client_write()
rather than each implementation of the function having to query
these values.

Additionally changed the int return type to bool as this is more
representative of the function's usage.

Corrected the order of the upgrade_tls() functions and moved the handler
upgrade and getsock() functions out from the middle of the state related
functions.

Corrected the order of the pop3_state_capa() / imap_state_capability()
and the pop3_state_capa_resp() / imap_state_capability_resp() functions
to match the execution order.

Test 1212 added to verify

Bug: http://curl.haxx.se/bug/view.cgi?id=1190