New winetricks 20080216: fixed comctl32 override, hide winetrickscache, add --version option

[Dan Kegel]

Austin nudged me into fixing comctl32 override, which has
been broken since wine added support for sxs assemblies.
He also was the third person to suggest hiding winetrickscache,
so I guess it's what people want.
And I added a --version option for a guy who said it would
make packaging easier.

As always, it's available at
 http://kegel.com/wine/winetricks
and the svn repository is
 http://code.google.com/p/winezeug/