Add a 'cygwin' target to execute setup_mount.bat explicitly as a...

third_party/ffmpeg/ffmpeg.gyp

 # Copyright (c) 2009 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.
 
 {
   'includes': [
     '../../build/common.gypi',
   ],
   'target_defaults': {
     'conditions': [
@@ skipping 51 matching lines @@
               'include/win',
             ],
             'link_settings': {
               'libraries': [
                 '<(PRODUCT_DIR)/lib/avcodec-52.lib',
                 '<(PRODUCT_DIR)/lib/avformat-52.lib',
                 '<(PRODUCT_DIR)/lib/avutil-50.lib',
               ],
             },
           },
+          'dependencies': ['../../build/win/system.gyp:cygwin'],
           'rules': [
             {
               'rule_name': 'generate_libs',
               'extension': 'def',
               'inputs': [
                 'generate_libs.py',
               ],
               'outputs': [
                 '<(PRODUCT_DIR)/lib/<(RULE_INPUT_ROOT).lib',
               ],
               'variables': {
                 'def_files': [
                   'avcodec-52.def',
                   'avformat-52.def',
                   'avutil-50.def',
                 ],
               },
               'action': ['python', '<@(_inputs)', '-o', '<(PRODUCT_DIR)/lib', '<@(RULE_INPUT_PATH)'],
               'message': 'Generating import libraries',
             },
           ],
         }],
       ],
     },
   ],
 }