bug#47119: 28.0.50; [patch][Dired] new user option for compressing dir suffix

[Lars Ingebrigtsen]

Sun Lin <sunlin7@yahoo.com> writes:

> There is another user option `compress-file-default-suffix` that allow user 
> custom
> default suffix for compressing file in dired-mode.
>
> These two patch allow user custom suffix for compressing folder and file in
> dired-mode by pressing "Z".
>
> Both two patches are attached. 

Thanks; applied to Emacs 28 with some small changes.

I'm not quite sure I understood the \000 change, but in testing, things
seem to work fine for me.

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