glapi: gl_enums.py: use main() function for if __name__ == "__main__"

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>
Acked-by: Matt Turner <mattst88@gmail.com>

src/mapi/glapi/gen/gl_enums.py

@@ -211,9 +211,13 @@ def _parser():
     return parser.parse_args()
 
 
-if __name__ == '__main__':
+def main():
     args = _parser()
     api_list = [gl_XML.parse_GL_API(args.input_file)]
 
     printer = PrintGlEnums()
     printer.Print(api_list)
+
+
+if __name__ == '__main__':
+    main()