Changing smbus ABI

[Michael Gmelin]

I'm planning to change the smbcmd structure in an incompatible way (see
'man smb' and https://reviews.freebsd.org/D1955?id=4055#inline-12187) in
HEAD.

I'm not aware of any applications relying on this ABI and adding a
compatibility wrapper later shouldn't be a big deal either. I would
prefer to avoid the additional complexity introduced by such wrapper if
it isn't required anyway.

- Michael

-- 
Michael Gmelin