Adds generator support for Xcode 5 xctest targets.

test/mac/xctest/App/Classes/Shared+Category.m

Index: test/mac/xctest/App/Classes/Shared+Category.m
diff --git a/test/prune_targets/lib2.cc b/test/mac/xctest/App/Classes/Shared+Category.m
similarity index 53%
copy from test/prune_targets/lib2.cc
copy to test/mac/xctest/App/Classes/Shared+Category.m
index aed394afcff768af538513e67e47170f954a36c3..44dec39e1e2153928068d7db408a2dee5fdd20e7 100644
--- a/test/prune_targets/lib2.cc
+++ b/test/mac/xctest/App/Classes/Shared+Category.m
@@ -1,6 +1,10 @@
 // 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 "Shared+Category.h"
 
-void libfunc2() {
+@implementation Shared (Category)
+- (NSString *)sharedCategoryMethod {
+  return NSStringFromSelector(_cmd);
 }
+@end