* gcc-interface/Make-lang.in (GNATLIBFLAGS, GNATLIBCFLAGS, THREAD_KIND,
	TRACE): Reintroduce.
	(ada/tracebak.o, ada/targext.o, ada/cio.o, ada/init.o,
	ada/initialize.o, ada/raise.o): Reintroduce explicit compilation rules.

From-SVN: r180246