win: make msvs_shard work properly for static_library references

test/win/shard/shard.gyp

 # 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.
 
 {
  'targets': [
     {
       'target_name': 'shard',
       'type': 'static_library',
       'msvs_shard': 4,
       'sources': [
         'hello1.cc',
         'hello2.cc',
         'hello3.cc',
         'hello4.cc',
       ],
       'product_dir': '<(PRODUCT_DIR)',
     },
+    {
+      'target_name': 'refs_to_shard',
+      'type': 'executable',
+      'dependencies': [
+        # Make sure references are correctly updated.
+        'shard',
+      ],
+      'sources': [
+        'hello.cc',
+      ],
+    },
   ]
 }