bug#10107: 23.2; Add command gud-quit

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: giecrilj@stegny.2a.pl,  10107@debbugs.gnu.org
> Date: Sun, 06 Jun 2021 15:05:01 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Why not invoke kill-process instead?
> 
> delete-process is more general (works on all process-like things) and
> therefore seems more useful as a user-level command.

But the OP wanted to kill only real subprocesses, no?