Issues when using ctypes on a multiplatform app

While this is a bug in ctypes perse, it brakes distutilsextra.auto badly. If an application is written for both linux and windows and wintypes are used on the windows code the following error occurs:

Traceback (most recent call last):
  File "setup.py", line 105, in <module>
    'clean' : SSOClean})
  File "/usr/lib/python2.6/dist-packages/DistUtilsExtra/auto.py", line 95, in setup
    __requires(attrs, src_all)
  File "/usr/lib/python2.6/dist-packages/DistUtilsExtra/auto.py", line 392, in __requires
    __add_imports(imports, s, attrs)
  File "/usr/lib/python2.6/dist-packages/DistUtilsExtra/auto.py", line 341, in __add_imports
    if __external_mod(node.module, attrs):
  File "/usr/lib/python2.6/dist-packages/DistUtilsExtra/auto.py", line 317, in __external_mod
    path = __import__(module).__file__
  File "/usr/lib/python2.6/ctypes/wintypes.py", line 23, in <module>
    class VARIANT_BOOL(_SimpleCData):
ValueError: _type_ 'v' not supported

This issue should be fairly simple to fix on distutils.