cogl/cogl-renderer.c: Avoid Clash with Newer Windows SDKs

The DriverCallback is a function that is defined by the Windows SDK 8.0+
headers, which was initially used for device driver development.  The use
of DriverCallback would cause a clash, causing things to break when built
with newer Windows SDKs, so rename DriverCallback to CoglDriverCallback to
avoid this problem.

Reviewed-by: Neil Roberts <neil@linux.intel.com>

cogl/cogl-renderer.c

@@ -369,12 +369,12 @@ cogl_renderer_check_onscreen_template (CoglRenderer *renderer,
   return TRUE;
 }
 
-typedef CoglBool (*DriverCallback) (CoglDriverDescription *description,
-                                    void *user_data);
+typedef CoglBool (*CoglDriverCallback) (CoglDriverDescription *description,
+                                        void *user_data);
 
 static void
 foreach_driver_description (CoglDriver driver_override,
-                            DriverCallback callback,
+                            CoglDriverCallback callback,
                             void *user_data)
 {
 #ifdef COGL_DEFAULT_DRIVER