bug#23982: [master] Treat errno EINPROGRESS and ENOTCONN as EAGAIN for async connection

[Eli Zaretskii]

> From: npostavs@users.sourceforge.net
> Date: Fri, 15 Jul 2016 23:33:00 -0400
> Cc: 23982@debbugs.gnu.org
> 
> > emacs -Q --eval "(erc-tls :server \"irc.freenode.net\" :port 6697 :nick 
> > \"test\")"
> >
> > Current master branch will gave up connecting.
> 
> On both Window and GNU/Linux this successfully connect both with and
> without the patch, i.e., patch seems not to be needed on non-OSX
> platforms, but it doesn't seem to hurt either.

I think this fact should be reflected in some comment to the code
changed by the patch.

Thanks.