Revamped the thread configure stuff. Now dce threads (old posix draft) are

1999-03-11  Sebastian Wilhelmi  <wilhelmi@ira.uka.de>

	* configure.in: Revamped the thread configure stuff. Now dce
	threads (old posix draft) are recogniced. This is necessary,
	because dce threads are in fact working quite differently from
	posix threads. Also changed the conditions for checking for MT
	safe functions a bit, because G_THREADS_IMPL_NONE still have to
	compile thread safe.

	* gthread/gthread-posix.c: Now handle both dce and posix
	threads. They are sufficently equal.

NOTE: Please do not commit my change to
glib-1-2/{acconfig.h,configure.in,config.h.win32} from 1999-03-03, as
the current change will take care of that too.