make this a "const gpointer" rather than a gconstpointer to avoid warnings

make this a "const gpointer" rather than a gconstpointer to avoid warnings

	* glib/gthreadpool.c (wakeup_thread_marker): make this a "const
	gpointer" rather than a gconstpointer to avoid warnings later

	* glib/pcre/pcre_ucp_searchfuncs.c:
	* glib/pcre/pcre_valid_utf8.c: #include "config.h"

	* glib/tests/printf.c (test_d): fool gcc into not warning about
	some printf format strings that we know are dubious

svn path=/trunk/; revision=7552