Bug 628252 - os2.cc fails to compile against GCC 4.6, missing #include <cstddef>; r,a=roc

--HG--
extra : rebase_source : 189840f90983b82a4f39bc7760d70ae21ccc69ab

gfx/ots/src/os2.cc

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <cstddef>
+
 #include "os2.h"
 
 #include "head.h"