bug#40665: 28.0.50; tls hang on local ssl

[Robert Pluim]

>>>>> On Mon, 03 Aug 2020 07:58:31 +0200, Lars Ingebrigtsen <larsi@gnus.org> 
>>>>> said:

    Lars> Lars Ingebrigtsen <larsi@gnus.org> writes:
    >> I think the reasoning sounds correct, and I'm now testing it in this
    >> Emacs, and I'm not seeing any regressions.
    >> 
    >> I'll test it a bit more, and if I can find no problems, I'll apply your
    >> patch to Emacs 28.

    Lars> This patch also seems to fix a long-standing problem in Gnus where
    Lars> several simultaneous TLS connections would make Gnus hang.

    Lars> I've now applied it to Emacs 28.1.  If no problems crop up in Emacs
    Lars> 28.1, we should consider cherry-picking it for Emacs 27.2.

Thanks Lars. It was on my list, but that list is only getting longer
at the moment.

Derek, thanks for the patch, sorry it took so long.

Robert