bug#39553: 28.0.50; ada mode was removed

[Stefan Kangas]

Eli Zaretskii <eliz@gnu.org> writes:

>> I'm not sure where that leaves us...
>
> It leaves us with a job that someone should do, so that we could
> bundle ELPA packages with Emacs releases.

Right.  Sorry to not be more clear, but what I mean more specifically is
that I don't understand what needs doing here.

I suppose `M-x list-packages U' should consider also built-in packages.

Anything else?