ninja/mac: Put dylibs directly into the product directory.

test/mac/copy-dylib/test.gyp

+# Copyright (c) 2012 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+{
+  'targets': [
+    {
+      'target_name': 'my_dylib',
+      'type': 'shared_library',
+      'sources': [ 'empty.c', ],
+    },
+    {
+      'target_name': 'test_app',
+      'product_name': 'Test App',
+      'type': 'executable',
+      'mac_bundle': 1,
+      'dependencies': [ 'my_dylib', ],
+      'sources': [
+        'empty.c',
+      ],
+      'copies': [
+        {
+          'destination': '<(PRODUCT_DIR)/Test App.app/Contents/Resources',
+          'files': [
+            '<(PRODUCT_DIR)/libmy_dylib.dylib',
+          ],
+        },
+      ],
+    },
+  ],
+}
+