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

[Olivier Certner]

> 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. 

-- 
Olivier Certner