Import OpenGL ES 3.0 headers from Khronos SVN

Add MODULE_LICENSE_MIT: The GLES headers use an MIT license or a
slight variant of it (the "SGI Free Software License B version 2.0",
http://oss.sgi.com/projects/FreeB/).

Change-Id: Ic8f946341cdd0d579f51b6f7a3ee109cd31b1691
diff --git a/opengl/include/GLES2/gl2.h b/opengl/include/GLES2/gl2.h
index d16f895..c2d8357 100644
--- a/opengl/include/GLES2/gl2.h
+++ b/opengl/include/GLES2/gl2.h
@@ -1,7 +1,7 @@
 #ifndef __gl2_h_
 #define __gl2_h_
 
-/* $Revision: 10602 $ on $Date:: 2010-03-04 22:35:34 -0800 #$ */
+/* $Revision: 20555 $ on $Date:: 2013-02-12 14:32:47 -0800 #$ */
 
 #include <GLES2/gl2platform.h>
 
@@ -431,7 +431,6 @@
 #define GL_RGB5_A1                        0x8057
 #define GL_RGB565                         0x8D62
 #define GL_DEPTH_COMPONENT16              0x81A5
-#define GL_STENCIL_INDEX                  0x1901
 #define GL_STENCIL_INDEX8                 0x8D48
 
 #define GL_RENDERBUFFER_WIDTH             0x8D42