Added GLX_ARB_create_context tokens.

src/native/linux/extgl_glx.h

@@ -263,6 +263,14 @@
 /* GLX_ARB_framebuffer_sRGB  */
 #define GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB	0x20B2
 
+/* GLX_ARB_create_context  */
+#define GLX_CONTEXT_MAJOR_VERSION_ARB	0x2091
+#define GLX_CONTEXT_MINOR_VERSION_ARB	0x2092
+#define GLX_CONTEXT_FLAGS_ARB			0x2094
+
+#define GLX_CONTEXT_DEBUG_BIT_ARB				0x0001
+#define GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB	0x0002
+
 typedef XID GLXContextID;
 typedef XID GLXPixmap;
 typedef XID GLXDrawable;