undef standard *printf before (re)defining them

Peteris Krumins pointed out that MingW32 doesnt provide a batch file to set the path to the bin folder.

some brief hints about gssapi and libssh2

based on his comments/suggestions.

fixed link order in case libssh2 is build with zlib.

non-ASCII systems.

it into a few new functions.
Fixed a few leaks in out of memory conditions, including for test case 231.

LIBSSH2_APINO

changed 'rm -f' to 'del /f' so it works without GnuUtils as Peteris Krumins pointed out; changed to use latest external libs.

Peteris Krumins pointed out that the standard MingW32 build depends on zlib; removed that, and added another option for zlib build, and renamed all other targets to reflect zlib dependency.

release the next curl until there is a libssh2 0.16 released.

(http://curl.haxx.se/bug/view.cgi?id=1766320) pointing out that the libcurl
code accessed two curl_easy_setopt() options (CURLOPT_DNS_CACHE_TIMEOUT and
CURLOPT_DNS_USE_GLOBAL_CACHE) as ints even though they're documented to be
passed in as longs, and that makes a difference on 64 bit architectures.

after 7.16.2. This is much due to the different treatment file:// gets
internally, but now I added test 231 to make it less likely to happen again
without us noticing!

POST

was set, this should make it work for all cases!

passed to it with curl_easy_setopt()! Previously it has always just refered
to the data, forcing the user to keep the data around until libcurl is done
with it. That is now history and libcurl will instead clone the given
strings and keep private copies.

NTLM, and he provided test code and a test server and we worked out a bug
fix. We failed to count sent body data at times, which then caused internal
confusions when libcurl tried to send the rest of the data in order to
maintain the same connection alive.

(and then I did some minor reformatting of code in lib/http.c)

configure made libcurl use blocking sockets on AIX 4 and 5, while that
wasn't the intention.

when using the socket API