Add COGL_DISABLE_DEPRECATION_WARNINGS to the build flags

Cogl 1.16 has deprecated a lot of API which it will be difficult for
Clutter to catch up with. For the time being the warnings are just
being disabled to keep the build output clean.

https://bugzilla.gnome.org/show_bug.cgi?id=703877

clutter/Makefile.am

@@ -19,6 +19,7 @@ AM_CPPFLAGS = \
 	-DCLUTTER_SYSCONFDIR=\""$(sysconfdir)"\" \
 	-DCLUTTER_COMPILATION=1			\
 	-DCOGL_ENABLE_EXPERIMENTAL_API		\
+	-DCOGL_DISABLE_DEPRECATION_WARNINGS	\
 	-DG_LOG_DOMAIN=\"Clutter\" 		\
 	-I$(top_srcdir) 			\
 	-I$(top_srcdir)/clutter			\

clutter/deprecated/clutter-rectangle.c

@@ -36,7 +36,6 @@
 #include "config.h"
 #endif
 
-#define COGL_DISABLE_DEPRECATION_WARNINGS
 #define CLUTTER_DISABLE_DEPRECATION_WARNINGS
 #include "deprecated/clutter-rectangle.h"
 #include "deprecated/clutter-actor.h"

clutter/deprecated/clutter-shader.c

@@ -52,7 +52,6 @@
 #include <unistd.h>
 #endif
 
-#define COGL_DISABLE_DEPRECATION_WARNINGS
 #define CLUTTER_DISABLE_DEPRECATION_WARNINGS
 
 #include <glib.h>

clutter/deprecated/clutter-texture.c

@@ -48,7 +48,6 @@
 #endif
 
 /* sadly, we are still using ClutterShader internally */
-#define COGL_DISABLE_DEPRECATION_WARNINGS
 #define CLUTTER_DISABLE_DEPRECATION_WARNINGS
 
 /* This file depends on the glib enum types which aren't exposed