Adds generator support for Xcode 5 xctest targets.

test/mac/xctest/Shared/Shared.h

Index: test/mac/xctest/Shared/Shared.h
diff --git a/test/prune_targets/lib_indirect.cc b/test/mac/xctest/Shared/Shared.h
similarity index 69%
copy from test/prune_targets/lib_indirect.cc
copy to test/mac/xctest/Shared/Shared.h
index 92d9ea40db811b235b37f10542b635a3222d9886..ebf5d3fecbeeafc85130a657ee7d289906ec5975 100644
--- a/test/prune_targets/lib_indirect.cc
+++ b/test/mac/xctest/Shared/Shared.h
@@ -1,6 +1,8 @@
 // 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.
+#import <Foundation/Foundation.h>
+
+@interface Shared : NSObject
+@end
 
-void libfunc_indirect() {
-}