Ensure that limits, algorithm, etc. definitions are defined first before
attempting to include debug.h so that appropriate feature tests work as
expected.

file upstream bug

--- webkitgtk-2.8.3/Source/ThirdParty/ANGLE/src/common/mathutil.h	2015-04-08 23:54:00.000000000 -0700
+++ webkitgtk-2.8.3/Source/ThirdParty/ANGLE/src/common/mathutil.h	2015-07-10 21:15:10.772978135 -0700
@@ -9,8 +9,6 @@
 #ifndef LIBGLESV2_MATHUTIL_H_
 #define LIBGLESV2_MATHUTIL_H_
 
-#include "common/debug.h"
-
 #if defined(_WIN32)
 #include <intrin.h>
 #endif
@@ -19,6 +17,8 @@
 #include <algorithm>
 #include <string.h>
 
+#include "common/debug.h"
+
 namespace gl
 {