[patch] Fix for named(8) on OpenRD

[Mark Tinguely]

Mark Tinguely wrote:
>
> The mail archives says this came up in Feb 2010. I said then and I 
> will say again, we should add a cmpxchg() command to the library, or 
> IMO a better place, include/machine/atomic.h.
>
> --Mark Tinguely
>
It does exist. Is there a reason bind9 does not use atomic_cmpset_32()?

--Mark "the embarrassed".