bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil

[Eli Zaretskii]

> From: Thomas Fitzsimmons <fitzsim@fitzsim.org>
> Cc: fgunbin@fastmail.fm,  33050@debbugs.gnu.org,  alan@idiocy.org
> Date: Fri, 26 Oct 2018 11:41:02 -0400
> 
> That said, it is probably a bad idea to warn or signal an error if all
> ptys are busy in the p-c-t t case.  Anyway, I thought I'd mention it;
> maybe the documentation update can address this point as well.

Right, thanks for pointing that out.

> How about I make the change conditional on Mac OS on the release branch,
> and unconditional on the master branch (once the fix for 33154 is
> committed)?

Sounds good to me, thanks.