Remove some unused code

Change-Id: Ie865cdf564e2562db7febbdef6b7bfa75e44859c
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
Clean up more stuff in qv8engine

Change-Id: Ia31d5abd4694b1c67115e75f0d0f134a65d4d775
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>