Adds generator support for Xcode 5 xctest targets.

test/prune_targets/lib1.cc

Index: test/prune_targets/lib1.cc
===================================================================
--- test/prune_targets/lib1.cc	(revision 1773)
+++ test/prune_targets/lib1.cc	(working copy)
@@ -2,5 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-void libfunc1() {
-}
+#import "MyClass.h"

[Mark Mentovai, 2013/10/30 22:16:51]

Ah, there’s something weird with your patch. I assume that this was supposed to
be the new file MyClass.m, and not an edit of lib1.cc in a completely unrelated
test.

+
+@implementation MyClass
+@end