Re: master 2c79a8f 2/2: Use posix_spawn if possible.

[Eli Zaretskii]

> From: Saulius Menkevicius <sauliusmenkevicius@fastmail.com>
> Date: Mon, 7 Feb 2022 23:12:27 +0200
> Cc: Alan Third <alan@idiocy.org>, emacs-devel@gnu.org, p.stephani2@gmail.com,
>  Matt Armstrong <matt@rfc20.org>, Eli Zaretskii <eliz@gnu.org>,
>  mituharu@math.s.chiba-u.ac.jp
> 
> Hello Robert, Eli,
> 
> I can confirm that this patch is needed for emacs-28 too, as currently emacs 
> on macOS blocks SIGCHLD the same way as it does on Linux.
> 
> Applying Robert’s patch on emacs-28 fixes the issue on macOS.

How important is this on macOS?  I _really_ don't want to start
experiments with signals on the release branch, I prefer to tell users
C# is broken on macOS unless they either build without posix_spawn or
use the master branch.