linux: use an in-tree copy of gold by default

tools/licenses.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Utility for checking and processing licensing information in third_party
 directories.
 
 Usage: licenses.py <command>
 
@@ skipping 45 matching lines @@
     # Only binaries, used during development.
     os.path.join('third_party','valgrind'),
 
     # Two directories that are the same as those in base/third_party.
     os.path.join('v8','src','third_party','dtoa'),
     os.path.join('v8','src','third_party','valgrind'),
 
     # Used for development and test, not in the shipping product.
     os.path.join('third_party','bidichecker'),
     os.path.join('third_party','cygwin'),
+    os.path.join('third_party','gold'),
     os.path.join('third_party','lighttpd'),
     os.path.join('third_party','mingw-w64'),
     os.path.join('third_party','pefile'),
     os.path.join('third_party','python_26'),
 
     # Stuff pulled in from chrome-internal for official builds/tools.
     os.path.join('third_party', 'clear_cache'),
     os.path.join('third_party', 'gnu'),
     os.path.join('third_party', 'googlemac'),
     os.path.join('third_party', 'pcre'),
@@ skipping 235 matching lines @@
     elif command == 'credits':
         if not GenerateCredits():
             return 1
     else:
         print __doc__
         return 1
 
 
 if __name__ == '__main__':
   sys.exit(main())