Work around "relocation truncated to fit: R_MIPS_CALL16" on mips64.

--- gtk/Makefile.in.orig	Fri Apr  1 12:41:04 2011
+++ gtk/Makefile.in	Sun Oct 27 21:50:49 2013
@@ -442,7 +442,7 @@ GTK_OVERRIDES = \
 	gtkwidget.override 	\
 	gtkwindow.override
 
-_gtk_la_CFLAGS = $(PYCAIRO_CFLAGS) $(GTK_CFLAGS) $(am__append_33)
+_gtk_la_CFLAGS = $(PYCAIRO_CFLAGS) $(GTK_CFLAGS) -mxgot $(am__append_33)
 _gtk_la_LDFLAGS = $(common_ldflags) -export-symbols-regex init_gtk
 _gtk_la_LIBADD = $(GTK_LIBS)
 _gtk_la_SOURCES = \