bug#44598: [PATCH] Do not show obsolete options in customize

[Drew Adams]

> In a recent discussion on emacs-devel,[1]

Wow.  I missed that.  I've responded there now.

> > IMO, we shouldn't show obsolete options at all in a Custom buffer,
> > for the same reason why we remove them from the manuals.
> 
> How about the attached patch?

FTR, I disagree with this approach.  I think it hurts
more than it helps.

If customizing some _particular_ option has a very
negative effect, then it could be dealt with specially.
But to just remove customization of all obsolete options
makes no sense to me.  And "for the same reason" as not
documenting something that's obsolete doesn't sound like
a sound reason to me, at all.  Doc is one thing.  Use is
another.