This commit merges the glib-threads branch into the main

branch. See the ChangeLog for details of the changes.

In brief overview:

 - The set of threading functions can be set
 - A default implementation is provided in -lgthread
 - All static data structures are locked using these
   functions if g_thread_init() is called.

glib/grel.c

@@ -15,6 +15,11 @@
  * License along with this library; if not, write to the Free
  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
+
+/* 
+ * MT safe
+ */
+
 #include "glib.h"
 #include <stdarg.h>
 #include <string.h>