cogl: Install cogl-trace.h and include from cogl.h

This is so that cogl-trace.h can start using things from cogl-macros.h,
and so that it doesn't leak cogl-config.h into the world, while exposing
it to e.g. gnome-shell so that it can make use of it as well. There is
no practical reason why we shouldn't just include cogl-trace.h via
cogl.h as we do with everything else.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/1059

src/core/util.c

@@ -39,7 +39,7 @@
 #include <X11/Xutil.h>  /* Just for the definition of the various gravities */
 
 #include "clutter/clutter.h"
-#include "cogl/cogl-trace.h"
+#include "cogl/cogl.h"
 #include "meta/common.h"
 #include "meta/main.h"
 
@@ -769,7 +769,7 @@ destroy_later (MetaLater *later)
   unref_later (later);
 }
 
-#ifdef HAVE_TRACING
+#ifdef COGL_HAS_TRACING
 static const char *
 later_type_to_string (MetaLaterType when)
 {