bug#23864: 25.1.50; Poor network responsivenes using open-network-stream

[Eli Zaretskii]

> Cc: 23864@debbugs.gnu.org
> From: Paul Eggert <eggert@cs.ucla.edu>
> Date: Mon, 4 Jul 2016 00:51:10 +0200
> 
> Thanks, that fixes part of the remaining bug, but I see another case 
> where there's a problem: we need to test the minimum of the two end 
> times against "now". I installed the attached further patch into 
> 'master', which I hope puts this all to rest on 'master'. It is indeed a 
> tricky area.

Thanks.

Do you consider these changes safe for back-porting to emacs-25?