ninja&make/mac: Only pass -x for loadable_modules.

test/mac/strip/test-defaults.gyp

+# Copyright (c) 2013 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.
+{
+  'make_global_settings': [
+    ['CC', '/usr/bin/clang'],
+  ],
+  'target_defaults': {
+    'xcode_settings': {
+      'GCC_VERSION': 'com.apple.compilers.llvm.clang.1_0',
+      'DEPLOYMENT_POSTPROCESSING': 'YES',
+      'STRIP_INSTALLED_PRODUCT': 'YES',
+    },
+  },
+  'targets': [
+    {
+      'target_name': 'single_dylib',
+      'type': 'shared_library',
+      'sources': [ 'file.c', ],
+    },
+    {
+      'target_name': 'single_so',
+      'type': 'loadable_module',
+      'sources': [ 'file.c', ],
+    },
+    {
+      'target_name': 'single_exe',
+      'type': 'executable',
+      'sources': [ 'main.c', ],
+    },
+
+    {
+      'target_name': 'bundle_dylib',
+      'type': 'shared_library',
+      'mac_bundle': '1',
+      'sources': [ 'file.c', ],
+    },
+    {
+      'target_name': 'bundle_so',
+      'type': 'loadable_module',
+      'mac_bundle': '1',
+      'sources': [ 'file.c', ],
+    },
+    {
+      'target_name': 'bundle_exe',
+      'type': 'executable',
+      'mac_bundle': '1',
+      'sources': [ 'main.c', ],
+    },
+  ],
+}