win: make msvs_shard work properly for static_library references

test/win/shard/shard_ref.gyp

+# Copyright 2014 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': 'refs_to_shard_external_lib',
+      'type': 'static_library',
+      'dependencies': [
+        # Make sure references in other files are updated correctly.
+        'shard.gyp:shard',
+      ],
+      'sources': [
+        'hello.cc',
+      ],
+    },
+    {
+      'target_name': 'refs_to_shard_external_exe',
+      'type': 'executable',
+      'dependencies': [
+        # Make sure references in other files are updated correctly.
+        'shard.gyp:shard',
+      ],
+      'sources': [
+        'hello.cc',
+      ],
+    },
+    {
+      'target_name': 'refs_to_shard_external_dll',
+      'type': 'shared_library',
+      'dependencies': [
+        # Make sure references in other files are updated correctly.
+        'shard.gyp:shard',
+      ],
+      'sources': [
+        'hello.cc',
+      ],
+    },
+  ]
+}