README update

[Joseph S. Myers]

On Fri, 27 Apr 2012, Roland McGrath wrote:

> Still all looks fine enough to me, but I did get one pedant's twitch:
> 
> >  Currently these configurations are known to work using the `ports' add-on:
> [...]
> > +	am33*-*-linux-gnu	Not currently functional
> 
> These ("known to work" and "not currently functional") do not go together.
> 
> I think you can just commit whatever you want that has only minor wording
> differences from either of the versions posted.

I changed that bit to say "Currently these configurations have code in the 
`ports' add-on" rather than "... are known to work using the `ports' 
add-on" and committed.

-- 
Joseph S. Myers
joseph@codesourcery.com