Clean up unused vars/funcs from eee98b0e07

eee98b0e07 made some functions and
variables unused, which generate compiler warnings. So I've removed
them.

desktop_version/src/editor.cpp

@@ -3783,11 +3783,6 @@ void editorlogic(void)
     }
 }
 
-static void creategraphicoptions(void)
-{
-    game.createmenu(Menu::graphicoptions);
-}
-
 static void creategameoptions(void)
 {
     game.createmenu(Menu::options);