Adds generator support for Xcode 5 xctest targets.

test/mac/xctest/App/main.m

Index: test/mac/xctest/App/main.m
diff --git a/test/prune_targets/lib1.cc b/test/mac/xctest/App/main.m
similarity index 60%
copy from test/prune_targets/lib1.cc
copy to test/mac/xctest/App/main.m
index 692b7de6d82c927503c21607863f671307fa6cd1..6c171db29106f74de2373dbb4a9f8078c941cf39 100644
--- a/test/prune_targets/lib1.cc
+++ b/test/mac/xctest/App/main.m
@@ -1,6 +1,7 @@
 // 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.
-
-void libfunc1() {
+#import <Cocoa/Cocoa.h>
+int main(int argc, const char *argv[]) {
+  return NSApplicationMain(argc, argv);
 }