Test for sched_yield as the native yield function first. Corrected typo

Test for sched_yield as the native yield function first. Corrected typo

2000-03-22  Sebastian Wilhelmi  <wilhelmi@ira.uka.de>

	* configure.in: Test for sched_yield as the native yield function
	first. Corrected typo g_thread_sleep -> g_usleep. Corrected
	message for the pthread_create test. Negative Priorities are
	allowed (and used on Solaris), so consider
	sched_get_priority_min failed only if it returns -1, not <0. Check
	for sched_get_priority_min also in -lrt, if not found in -lpthread
	alone and add -lrt to G_THREAD_LIBS then. Remove special case
	handling of priorities for older solaris versions and posix
	threads. Thanks to Wan-Teh Chang <wtc@netscape.com> for suggesting
	some of those changes.

	* config.guess, config.sub, ltconfig, ltmain.sh:
	Upgrade to libtool 1.3.4.