Cleanups for the m68k backend

[Marc Espie]

In article <je4r1y4rl0.fsf@sykes.suse.de> you write:
>Bernardo Innocenti <bernie@develer.com> writes:
>
>|> If we deprecate these remaining platforms, we can finally say goodbye
>|> to this dual-syntax maintenance hell.
>
>Note that GAS accepts both syntaxes, so if every supported target is using
>GAS then we can rip it out immediately.  Anyone knows what assembler
>OpenBSD is using?  

An old version of gas with some patches that the FSF never bought back--long
story, don't ask.

I don't have an m68k box available any more to check whether it would work
or not...

I'll try to see if I can find one.