mesa: Add infrastructure for ARB_gpu_shader5.

Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>

src/glsl/glcpp/glcpp-parse.y

@@ -1236,6 +1236,9 @@ glcpp_parser_create (const struct gl_extensions *extensions, int api)
 
 	      if (extensions->ARB_texture_query_lod)
 	         add_builtin_define(parser, "GL_ARB_texture_query_lod", 1);
+
+	      if (extensions->ARB_gpu_shader5)
+	         add_builtin_define(parser, "GL_ARB_gpu_shader5", 1);
 	   }
 	}