..., where "support" means that the build doesn't fail, but it doesn't mean
that all target libraries get built and we get pretty test results for the
additional languages.

	* configure.ac (unsupported_languages) [GCN, nvptx]: Add 'ada'.
	(noconfigdirs) [GCN, nvptx]: Add 'target-libobjc',
	'target-libffi', 'target-libgo'.
	* configure: Regenerate.