Added support to disable built-in HUD elements

src/scriptapi_object.h

@@ -202,6 +202,9 @@ class ObjectRef
 	// hud_get(self, id)
 	static int l_hud_get(lua_State *L);
 
+	// hud_builtin_enable(self, id, flag)
+	static int l_hud_builtin_enable(lua_State *L);
+
 public:
 	ObjectRef(ServerActiveObject *object);