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.