V6ONLY undefined in py2.5, but works great under Vista
The Windows build for Python2.5 has IPV6_V6ONLY undefined. This works fine under Windows Vista if the value 27 is used.
This patch modifies the wsgi server to define IPV6_V6ONLY in a manner similar to IPPROTO_IPV6. With this in place, Vista machines happily run the server on both socket types.