* configure.in (unsupported_languages): New macro.

	* configure.in (unsupported_languages): New macro.
	<mmix-knuth-mmixware>: Set unsupported_languages.  Name explicit
	non-ported target libraries in noconfigdirs.
	<cris-*, crisv32-*> Ditto, except for non-aout, non-elf,
	non-linux-gnu.  Remove libgcj_ex_libffi.
 	<lang_frag loop>: Set add_this_lang=no if the language is in
	unsupported_languages.
	* configure: Regenerate.