'curl -v writes debugging to its network socket if stderr is closed'

pkg-config on the build host in order to detect OpenSSL compiler options.

file that was already completely downloaded caused an error, while it
doesn't if you don't use --fail! I added test case 194 to verify the fix.
Grrr. CURLOPT_FAILONERROR is now added to the list stuff to remove in
libcurl v8 due to all the kludges needed to support it.

good. I fixed.

both source and destination being the same host. It can be useful if you want
to move a file on a server or similar.

initiate the specific language operations, to make the IDN stuff work better.

fine even for third party transfers.

Changes for issue 50

and password fields properly in URLs, like
ftp://us?er:pass?word@site.com/. Added test 191 to verify the fix.

Added tld_check_name().

CURLOPT_FOLLOWLOCATION, libcurl reported error if a redirect happened even if
the new URL would provide the resumed file. Test case 188 added to verify the
fix (together with existing test 99).

based) IDN conversion fails. This is really due to a missing suitable
function in the libidn API that I hope we can remove once libidn gets a
function like this.

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=134133) and not to anyone
involved in the curl project! This happens when you try to curl a file from a
proftpd site using SSL. It seems proftpd sends a somewhat unorthodox PASS
response code (232 instead of 230). I relaxed the response code check to deal
with this and similar cases.

  formposts no longer include the path part. If you _really_ want them, you
  must provide your preferred full file name with CURLFORM_FILENAME.

  Added detection for libgen.h and basename() to configure. My custom
  basename() replacement function for systems without it, might be a bit too
  naive...

  Updated 6 test cases to make them work with the stripped paths.

  app to retrieve the errno variable after a (connect) failure. It will make
  sense to provide this for more failures in a more generic way, but let's
  start like this.

curl/multi.h header to work better in winsock-using apps.

properly using glibtoolize instead of plain libtoolize. (This is made if
glibtool was found and used instead of plain libtool.)