bug#4987: 23.1; shell-command: optionally include working dir in prompt

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Fri, 11 Oct 2019 01:20:15 +0200
> Cc: 4987@debbugs.gnu.org
> 
> > But one thing shell-command.el did that Emacs 23 doesn't appear to do,
> > is to include the working directory in the shell-command and
> > dired-do-shell-command prompts.  It'd be neat if Emacs did that, too.
> 
> This is a good idea.  How about the attached patch?

Thanks, LGTM.

I would suggest to name the defcustom to shell-command-prompt-show-cwd
instead, it sounds more accurate to me.