NewGRF: Add extension for more Action2 set IDs

src/newgrf_extension.cpp

@@ -61,6 +61,7 @@ extern const GRFFeatureInfo _grf_feature_list[] = {
 	GRFFeatureInfo("road_stops", 7),
 	GRFFeatureInfo("new_landscape", 2),
 	GRFFeatureInfo("more_objects_per_grf", 1, GFTOF_MORE_OBJECTS_PER_GRF),
+	GRFFeatureInfo("more_action2_ids", 1, GFTOF_MORE_ACTION2_IDS),
 	GRFFeatureInfo(),
 };