bug#45821: Emacs UDP support on Windows

[Robert Pluim]

>>>>> On Tue, 10 Jan 2023 12:41:12 +0000, Alex Matei <matei.alexandru@live.com> 
>>>>> said:

    Alex> Okay, it looks like the ‘connect-to-tls-ipv4-wait’ test just hangs
    Alex> (together with Emacs instance) so gdb still doesn’t capture any
    Alex> exceptions.

    Alex>   *   It looks like this will require debugging and potentially some 
more tracing on my end 😊

    Alex> It is great though that we have a good repro, that we can dive into! 🤞

I see the same, but in my case itʼs because gnutls-serv has crashed,
so it never responds to emacs.

Robert
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