Avoid a local port-stealing attack on Windows
On Windows, Tor is vulnerable to a port-stealing attack described on this StackOverflow post under the "Windows" heading: https://stackoverflow.com/questions/14388706/socket-options-so-reuseaddr-and-so-reuseport-how-do-they-differ-do-they-mean-t
In short, another app can set SO_REUSEADDR, then bind to a port that Tor is already bound to, stealing all future connections to Tor.
Therefore, I think we should set SO_EXCLUSIVEADDRUSE on all listener sockets on Windows, which prevents this attack.
We could do this near make_socket_reusable in connection_listener_new. make_socket_reusable already has a comment about this issue.
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