search towards the given path for includes and libraries. Noted
by Jason Harris.
* Makefile.am: Distribute tar-ustar.m4.
* libcurl.m4: If a PATH is given to --with-libcurl, look for
curl-config in that path. Bias directory search towards the given
path for includes and libraries.
(min_automake_version): New.
* LINGUAS: Added all languages we supported in 1.2.5.
Copied all po files from 1.2.5.
* autogen.sh: Updated to the modern version, grepping the required
tool versions from configure.ac.