Codechange: Use reserve/emplace when initializing object definitions.

This avoids unnecessary initialization of objects.

src/newgrf_object.cpp

@@ -123,11 +123,11 @@ void ResetObjects()
 	_object_specs.clear();
 
 	/* And add our originals. */
-	_object_specs.resize(lengthof(_original_objects));
+	_object_specs.reserve(lengthof(_original_objects));
 
 	for (uint16 i = 0; i < lengthof(_original_objects); i++) {
-		_object_specs[i] = _original_objects[i];
-		_object_specs[i].grf_prop.local_id = i;
+		ObjectSpec &spec = _object_specs.emplace_back(_original_objects[i]);
+		spec.grf_prop.local_id = i;
 	}
 
 	/* Set class for originals. */