Verifies the fix from commit 322f3d5a

I think curl should ignore this case and smtp.c should test for this.
Since RFC-2821 seems to allow a "null reverse-path". Ref.  "MAIL
FROM:<>" in section 3.7, page 25.

Example:
* upload completely sent off: 35out of 35 bytes

Should be:
* upload completely sent off: 35 out of 35 bytes

Related code not ready yet for this kind of checks.

Suffix rules cannot have any prerequisites of their own.

Added envvars to specify OpenSSL include, libpath and lib.
Added rule to create curlbuild.h from curlbuild.h.dist.

my_setopt and my_setopt_str no longer ignores curl_easy_setopt result.

Fixed some OOM handling issues.

Overhauled FindWin32CACert()

All paths to dependencies now quoted; synced examples makefile.

Also added check for __x86_64__ define since MinGW64 seems to define
the _M_X64 macro through a header not available for config-win32.h.

Fix posted by Tomas Hoger <thoger redhat com>.

Expanded the section about CURLOPT_URL to include the format of the URL
and detailed information and examples relating to specific protocols.

Fixed Curl_gethostname() so that it always returns the un-qualified
machine name rather than being dependent on the socket provider.

Note: The return of getenv("CURL_GETHOSTNAME") is also parsed in case
the developer / test harness provided a fully qualified domain name as
it's value as well.

Additionally function my_useragent() now provides default User-Agent string

Reorder handling of fields to match same order as the one given by current
definition order of 'Configurable' struct fields. Fields currently not handled
marked for further inspection.

Reviewing fields being free'd in free_config_fields() still pending

Additionally some code reorganization and direct OOM handling fixes,
just another step towards fixing curl tool issues uncovered 2011-09-15

Additionally fix data type of result vars for iconv() calls

Re-enabling MemoryTracking capability on 'src' subdirectory files and torture
tests have uncovered many issues which were going unnoticed in curl tool. So
here we go fixing some of them. Others still remain and should be addressed
ASAP, given that curl tool is used in our test harness also for test server
start verification purposes. There are even non-socket file descriptor leaks.

Use same preprocessor logic for curl tool MemoryTracking activation in source
files located in 'src' subdirectory as the one used for libcurl sources.