[issue1378] fromfd() and dup() for _socket on WIndows

[Christian Heimes]

Christian Heimes added the comment:

I've yet another idea for a tiny improvement. Instead of doing

   newfd = _socket.dup(socket_instance.fileno())

I prefer

   newfd = _socket.dup(socket_instance)

It removes some confusing magic and makes error checking on Windows
slightly easier.

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