Although I've not tested the Tomahawk build on Mac OS X, it *should*
work on it, so I'm using platforms.all here.
Telepathy and KDE support are disabled by default in order to not get in
the way of users who want to use a more minimalistic window-manager-only
setup. But I'm not sure whether it matters in reality, we'll see once
more people are using Tomahawk.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>