Use wheezy sysroot when building SDK

tools/bots/dart_sdk.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2015, 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.
 
 import os
 import os.path
 import shutil
 import sys
 import subprocess
 
 import bot
 import bot_utils
 
 utils = bot_utils.GetUtils()
 
 BUILD_OS = utils.GuessOS()
 
 (bot_name, _) = bot.GetBotName()
 CHANNEL = bot_utils.GetChannelFromName(bot_name)
 
 def BuildSDK():
   with bot.BuildStep('Build SDK'):
     if BUILD_OS == 'linux':
       sysroot_env = dict(os.environ)
       sysroot_env['DART_USE_WHEEZY'] = '1'
-      Run([sys.executable, './tools/generate_buildfiles.py', env=sysroot_env)
+      Run([sys.executable, './tools/generate_buildfiles.py'], env=sysroot_env)
     Run([sys.executable, './tools/build.py', '--mode=release',
          '--arch=ia32', 'create_sdk'])
     Run([sys.executable, './tools/build.py', '--mode=release',
          '--arch=x64', 'create_sdk'])
 
 def BuildDartdocAPIDocs(dirname):
   dart_sdk = os.path.join(bot_utils.DART_DIR,
                           utils.GetBuildRoot(BUILD_OS, 'release', 'ia32'),
                           'dart-sdk')
   dart_exe =  os.path.join(dart_sdk, 'bin', 'dart')
@@ skipping 186 matching lines @@
 
 if __name__ == '__main__':
   # We always clobber the bot, to make sure releases are build from scratch
   force = CHANNEL != bot_utils.Channel.BLEEDING_EDGE
   bot.Clobber(force=force)
 
   CreateUploadSDK()
   if BUILD_OS == 'linux':
     CreateUploadVersionFile()
     CreateUploadAPIDocs()