Fix build so we can make a Windows SDK!

tools/utils.py

 # 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.
 
 # This file contains a set of utilities functions used by other Python-based
 # scripts.
 
 import commands
 import os
 import platform
@@ skipping 25 matching lines @@
 
 # Try to guess the host architecture.
 def GuessArchitecture():
   id = platform.machine()
   if id.startswith('arm'):
     return 'arm'
   elif (not id) or (not re.match('(x|i[3-6])86', id) is None):
     return 'ia32'
   elif id == 'i86pc':
     return 'ia32'
+  elif '64' in id:
+    return 'x64'
   else:
     return None
 
 
 # Try to guess the number of cpus on this machine.
 def GuessCpus():
   if os.path.exists("/proc/cpuinfo"):
     return int(commands.getoutput("grep -E '^processor' /proc/cpuinfo | wc -l"))
   if os.path.exists("/usr/bin/hostinfo"):
     return int(commands.getoutput('/usr/bin/hostinfo | grep "processors are logically available." | awk "{ print \$1 }"'))
@@ skipping 199 matching lines @@
   def __init__(self, value):
     self.value = value
 
   def __str__(self):
     return repr(self.value)
 
 
 if __name__ == "__main__":
   import sys
   Main(sys.argv)