push G_THREADS_MANDATORY over the cliff

This was used as an optimisation for the macro hackery that used to live
in gthread.h.  If a particular library or program knew that it could
rely on thread support being enabled, it would allow for static
evaluation of conditionals in some of those macros.

Since the macros are dead and thread support is now always-on, we can
get rid of this bit of legacy.

gio/Makefile.am

@@ -37,8 +37,6 @@ AM_CPPFLAGS = \
 	-DG_LOG_DOMAIN=\"GLib-GIO\"			\
 	$(gmodule_INCLUDES)				\
 	$(GLIB_DEBUG_FLAGS)				\
-	-DG_THREADS_MANDATORY				\
-	-DG_DISABLE_DEPRECATED				\
 	-DGIO_COMPILATION				\
 	-DGIO_MODULE_DIR=\"$(GIO_MODULE_DIR)\"	
 

glib/Makefile.am

@@ -51,7 +51,6 @@ AM_CPPFLAGS = 				\
 	$(pcre_inc) 			\
 	-DG_LOG_DOMAIN=\"GLib\" 	\
 	$(GLIB_DEBUG_FLAGS) 		\
-	-DG_DISABLE_DEPRECATED 		\
 	-DGLIB_COMPILATION 		\
 	-DPCRE_STATIC
 

glib/deprecated/gthread.h

@@ -265,11 +265,7 @@ gboolean g_thread_get_initialized        (void);
 
 GLIB_VAR gboolean g_threads_got_initialized;
 
-#if defined(G_THREADS_MANDATORY)
+#define g_thread_supported()     (1)
-#define g_thread_supported()     1
-#else
-#define g_thread_supported()    (g_threads_got_initialized)
-#endif
 
 GLIB_DEPRECATED
 GMutex *        g_mutex_new             (void);

gobject/Makefile.am

@@ -13,8 +13,6 @@ AM_CPPFLAGS = 					\
 	-DG_LOG_DOMAIN=\"GLib-GObject\"		\
 	$(gthread_INCLUDES) 			\
 	$(GLIB_DEBUG_FLAGS)			\
-	-DG_THREADS_MANDATORY			\
-	-DG_DISABLE_DEPRECATED			\
 	-DGOBJECT_COMPILATION
 
 gobject.def: gobject.symbols