sysutils/fsearch: update the port to the latest patch release 0.1.2

Switch away from using g_utf8_collate_key_for_filename() for version
sorting because it's way too slow. For comparison, sorting 3 million
files by name takes less than a second (~850ms) with strverscmp() but
more than a minute (~95s) with g_utf8_collate_key_for_filename().

So it's roughly a hundred times slower. Instead, pull strverscmp()
implementation directly from the GNU library sources.