mesa: update glxext.h to version 20140810

Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
diff --git a/include/GL/glxext.h b/include/GL/glxext.h
index b96133e..174fc21 100644
--- a/include/GL/glxext.h
+++ b/include/GL/glxext.h
@@ -33,10 +33,10 @@
 ** used to make the header, and the header can be found at
 **   http://www.opengl.org/registry/
 **
-** Khronos $Revision: 27498 $ on $Date: 2014-07-25 19:12:07 -0700 (Fri, 25 Jul 2014) $
+** Khronos $Revision: 27684 $ on $Date: 2014-08-11 01:21:35 -0700 (Mon, 11 Aug 2014) $
 */
 
-#define GLX_GLXEXT_VERSION 20140725
+#define GLX_GLXEXT_VERSION 20140810
 
 /* Generated C header for:
  * API: glx
@@ -158,6 +158,13 @@
 #endif
 #endif /* GLX_VERSION_1_4 */
 
+#ifndef GLX_ARB_context_flush_control
+#define GLX_ARB_context_flush_control 1
+#define GLX_CONTEXT_RELEASE_BEHAVIOR_ARB  0x2097
+#define GLX_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB 0
+#define GLX_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB 0x2098
+#endif /* GLX_ARB_context_flush_control */
+
 #ifndef GLX_ARB_create_context
 #define GLX_ARB_create_context 1
 #define GLX_CONTEXT_DEBUG_BIT_ARB         0x00000001