bug#63072: 28.2; CC Mode: Fix "bsd" style and add "freebsd" and "openbsd" ones

[Eli Zaretskii]

> From: Olivier Certner <ocert.dev@free.fr>
> Cc: 63072@debbugs.gnu.org
> Date: Wed, 26 Apr 2023 15:53:21 +0200
> 
> > Given all that, I'm not sure we should single out these new styles at
> > all.  Once in 10 years any constant is eligible for a change.
> 
> Then maybe it's my turn not to understand. To me, allowing them to be changed 
> in 10 years from now is singling them out with respect to, e.g., "bsd" which, 
> as you said yourself in preamble, should not be changed after all these years.
> 
> Apart from this caveat, I'm fine with your conclusion. 

Let's see that patch of yours, then.

Thanks.