workaround android-only js module resolution issue

Summary: for some reason metro was not able to find js module with just .android.js variant. To workaround some build issue, added an empty .ios.js variant

Reviewed By: mdvacca

Differential Revision: D7115360

fbshipit-source-id: 40b95cf2efc4d3d599f39b88813469b6d78e7b48

Author: fkgozali

RNTester/js/ToolbarAndroidExample.ios.js

@@ -0,0 +1,13 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ * @providesModule ToolbarAndroidExample
+ */
+'use strict';
+
+// Not applicable to iOS.
+module.exports = require('View');