Fix crash in dsound test

[Ferenc Wagner]

Paul Millar <paulm at astro.gla.ac.uk> writes:

> The build failed.  It looks like there's a bug in CVS.  Both  
> CLSID_DirectSoundPrivate and DSPROPSETID_DirectSoundDevice defined multiple 
> times (the wine-version of mingw libraries and in the source).

Yes, there was a short discussion about this on 23-24 July
on wine-devel.  It reached no conclusion, though, and I
didn't try the various MinGW libraries recommended there.
The abundance of MinGW packages always confused me, and at
the moment I don't even know where I got mine from.  But it
can't compile the dsound tests, that's for sure.  Comments
welcome.
-- 
Feri.