bug#68367: 30.0.50; etc-fstab-generic-mode is missing cgroup2

[Eli Zaretskii]

> From: Stefan Kangas <stefankangas@gmail.com>
> Date: Wed, 10 Jan 2024 06:55:30 -0800
> Cc: Eli Zaretskii <eliz@gnu.org>
> 
> Stephen Berman via "Bug reports for GNU Emacs, the Swiss army knife of
> text editors" <bug-gnu-emacs@gnu.org> writes:
> 
> > While the misfontification isn't a regression -- the support for cgroups
> > (but only for cgroup v1) in etc-fstab-generic-mode was added in January
> > 2021 (commit 80d964ec8b) -- the fix could go into emacs-29, since cgroup
> > v2 became official in the Linux kernel in March 2016 (kernel 4.5); i.e.,
> > omitting cgroup2 was presumably an oversight in that commit.
> 
> I don't really have an opinion, but sounds good to me.  Eli?

I don't mind adding this to emacs-29.

Thanks.