bug#36017: 27.0.50; TLS 1.3 on macOS exhibits similar issue to #34341

[Robert Pluim]

>>>>> On Mon, 03 Jun 2019 20:38:37 +0200, Robert Pluim <rpluim@gmail.com> said:

    Robert> And that recipe works fine for me. Iʼll have to try again later 
today
    Robert> when I can use a different network that I have more control over.

    Robert> Actually, now that I look at it more closely, it does fail for me
    Robert> (sort of). I donʼt get a blank buffer, but I do get

    Robert> error in process filter: Staus: 

    Robert> If I retry in the same session, then I get a 401 as expected.

    Robert> Iʼll stick some debugging in gnutls.c and see what I can find.

    Robert> And Iʼll note that this behaviour is not limited to macOS: I see it 
on
    Robert> my GNU/Linux box as well.

And emacs-26 on macOS works correctly, so this is definitely an emacs
issue.

Robert