Adding correct dependencies for upload_sdk for Windows.

dart.gyp

 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 {
   'variables': {
     # These variables are used in the creation of the .vcproj file on 
     # Windows.
     'cygwin_dir': 'third_party/cygwin',
   },
@@ skipping 63 matching lines @@
             'tools/create_sdk.py',
             '<(PRODUCT_DIR)/dart-sdk',
           ],
           'message': 'Creating SDK.',
         },
       ],
     },
     {
       'target_name': 'upload_sdk',
       'type': 'none',
+      'conditions': [
+        ['OS=="win"', {
+          'msvs_cygwin_dirs': ['<(cygwin_dir)'],
+        }],
+      ],
       'dependencies': [
         'create_sdk',
       ],
       'actions': [
         {
           'action_name': 'upload_sdk_py',
           'inputs': [
             '<(PRODUCT_DIR)/dart-sdk',
             'tools/upload_sdk.py',
           ],
@@ skipping 12 matching lines @@
     # so don't build it for now.
     #{
     #  'target_name': 'client',
     #  'type': 'none',
     #  'dependencies': [
     #    'client/dart.gyp:fling',
     #  ],
     #},
   ],
 }