Added new default thread implementation on top of the mozilla nspr

1998-12-11  Sebastian Wilhelmi  <wilhelmi@ira.uka.de>

	* gthread/gthread-nspr.c, configure.in: Added new default thread
	implementation on top of the mozilla nspr library.

	* gmem.c, gmessaged.c, gthread/gthread.c, gthread/gthread-*.c:
	Changed GStaticMutex and GStaticPrivate in gmem.c and gmessages.c
	into GMutex and GPrivate resp. to make error reporting and use of
	gmem possible in most (not all, though) gthread functions. Also
	initialized the modules via new init functions.

	* configure.in: Fixed syntax bug in definition of type
	GStaticMutex.

	* gthread/testgthread.c: Updated to work with nspr, but see note
	there for remaining problems.