Update the pthreads snapshot version we want. Advice how to hand-expand

Update the pthreads snapshot version we want. Advice how to hand-expand

	* README.win32: Update the pthreads snapshot version we want.
	Advice how to hand-expand the makefile.*.in files.

	* config.h.win32.in: Define values needed by Sebastian Wilhelmi's
	new thread stuff.

	* glib.def: Add new functions.

	* glibconfig.h.win32.in: Update the pthreads snapshot version.
	Fix typo.

	* gthread.c: Include config.h, guard inclusion of unistd.h.  When
 	using gcc on Win32, g_thread_functions_for_glib_use must be marked
 	for export here, too.

	* gtimer.c: Implement g_usleep on native Win32 using Sleep (which
	only has millisecond granularity, though).

	* makefile.cygwin.in
	* makefile.msc.in: Update pthreads snapshot version. File
	name changes. Remove testgthread.

	* tests/makefile.cygwin.in
	* tests/makefile.msc.in: Add thread-test. Link with gthread lib.

	* gthread-posix.c: Guard pthread_attr_setscope call with test
	for _POSIX_THREAD_PRIORITY_SCHEDULING, which should be defined
	in a <pthread.h> that supports that feature.