Fix missing GLX_CONTEXT_OPENGL_NO_ERROR_ARB token

This change resolve compilation error that occurred when
glxext header is too old and does not contain required define.

Components: Framework

VK-GL-CTS issue: 581

Change-Id: Ifdb37f3921dceec0ea4d9f048aa1e8ac92826889
diff --git a/framework/platform/lnx/X11/tcuLnxX11GlxPlatform.cpp b/framework/platform/lnx/X11/tcuLnxX11GlxPlatform.cpp
index 8714c34..0194772 100644
--- a/framework/platform/lnx/X11/tcuLnxX11GlxPlatform.cpp
+++ b/framework/platform/lnx/X11/tcuLnxX11GlxPlatform.cpp
@@ -35,6 +35,10 @@
 #define GLX_GLXEXT_PROTOTYPES
 #include <GL/glx.h>
 
+#ifndef GLX_CONTEXT_OPENGL_NO_ERROR_ARB
+#define GLX_CONTEXT_OPENGL_NO_ERROR_ARB 0x31B3
+#endif
+
 namespace tcu
 {
 namespace lnx