Add the Khronos GLES headers.

src/GLES2/include/GLES/egl.h

+/*
+ * Skeleton egl.h to provide compatibility for early GLES 1.0
+ * applications. Several early implementations included gl.h
+ * in egl.h leading applications to include only egl.h
+ *
+ * $Revision: 6252 $ on $Date:: 2008-08-06 16:35:08 -0700 #$
+ */
+
+#ifndef __legacy_egl_h_
+#define __legacy_egl_h_
+
+#include <EGL/egl.h>
+#include <GLES/gl.h>
+
+#endif /* __legacy_egl_h_ */

src/GLES2/include/GLES/glplatform.h

+#ifndef __glplatform_h_
+#define __glplatform_h_
+
+/* $Revision: 10601 $ on $Date:: 2010-03-04 22:15:27 -0800 #$ */
+
+/*
+ * This document is licensed under the SGI Free Software B License Version
+ * 2.0. For details, see http://oss.sgi.com/projects/FreeB/ .
+ */
+
+/* Platform-specific types and definitions for OpenGL ES 1.X  gl.h
+ *
+ * Adopters may modify khrplatform.h and this file to suit their platform.
+ * You are encouraged to submit all modifications to the Khronos group so that
+ * they can be included in future versions of this file.  Please submit changes
+ * by sending them to the public Khronos Bugzilla (http://khronos.org/bugzilla)
+ * by filing a bug against product "OpenGL-ES" component "Registry".
+ */
+
+#include <KHR/khrplatform.h>
+
+#ifndef GL_API
+#define GL_API      KHRONOS_APICALL
+#endif
+
+#ifndef GL_APIENTRY
+#define GL_APIENTRY KHRONOS_APIENTRY
+#endif
+
+#endif /* __glplatform_h_ */