Search for C libraries directly in the directory they are in

* tta/perl/Texinfo/ModulePath.pm.in ($libraries_dir): set
$libraries_dir to the directory C libraries are in, instead of putting
the directory in front of @INC.

* tta/perl/Texinfo/XSLoader.pm (_find_file_in_inc): rename _find_file
as _find_file_in_inc.

* tta/perl/Texinfo/XSLoader.pm (load_libtool_library, init): move call
of _find_file_in_inc to init.  Find directly C libraries in
$Texinfo::ModulePath::libraries_dir.
4 files changed