Use Qt stable branches

We need a stable Qt for now, we can always move to dev and target
Qt 5.2 later.
qtdeclarative: Don't remove libQt5QmlDevTools.{a,la}

We automatically remove all static libraries after a build, unfortunately
we need this libraries and there's no shared version.
p11-kit: Disable trust paths for now

Need to handle this better, disable for now.
wayland: Fetch from upstream

Upstream has everything we need now.