win: make msvs_shard work properly for static_library references

test/win/gyptest-link-shard.py

 #!/usr/bin/env python
 
 # 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.
 
 """
 Make sure msvs_shard works correctly.
 """
 
 import TestGyp
 
 import sys
 
 if sys.platform == 'win32':
   test = TestGyp.TestGyp(formats=['msvs', 'ninja'])
 
   CHDIR = 'shard'
   test.run_gyp('shard.gyp', chdir=CHDIR)
   test.build('shard.gyp', test.ALL, chdir=CHDIR)
 
   test.built_file_must_exist('shard_0.lib', chdir=CHDIR)
   test.built_file_must_exist('shard_1.lib', chdir=CHDIR)
   test.built_file_must_exist('shard_2.lib', chdir=CHDIR)
   test.built_file_must_exist('shard_3.lib', chdir=CHDIR)
 
+  test.run_gyp('shard_ref.gyp', chdir=CHDIR)
+  test.build('shard_ref.gyp', test.ALL, chdir=CHDIR)
+
   test.pass_test()