* doc/sourcebuild.texi (Front End Directory): Document tags.
	* configure: Rebuilt.
	* configure.in (target_list): Added tags.
	* Makefile.in (TAGS): Depend on lang.clean.  Include subdirectory
	TAGS files by reference.
	* objc/Make-lang.in (objc.tags): New target.

From-SVN: r63808