Allow '@' as switch name in driver

[Neil Booth]

Geoff Keating wrote:-

> Andreas Tobler <toa@pop.agri.ch> writes:
> 
> > Geoffrey Keating wrote:
> > > This might help the powerpc-darwin bootstrap.  It certainly can't hurt.
> > 
> > Unfortunately it didn't help here.
> 
> It was in the wrong place, I needed to patch the similar lines below
> these...

I'm glad to see it's not just mortals like me that can't see their way
through specs 8-)

Neil.