From discussion in #572...

NetworkUtil::GetLocalAddress is used by CServerListManager's constructor to provide an idea of the server's own address for the first entry in the server list. Currently it works by opening a TCP connection to Google's public DNS server and using Qt's wrapper for getsockname to get the local end's address, which isn't ideal for privacy reasons.

We could rework this to use a connect()-ed UDP socket, which would achieve the same effect without actually sending any packets (on Linux/FreeBSD at least; I don't know if this works on Windows/MacOS). Or we might be able to get the address from one of the Jamulus server's existing sockets when replying to a server list request.