OpenCL: disable on Ivy Bridge integrated GPUs.

Ivy Bridge supports OpenCL on GPU, but it's too slow to be usable for scaling.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5926 b64f7644-9d1e-0410-96f1-a4d463321fa5
Fix a Segfault where the job struct is used after it's closed.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5927 b64f7644-9d1e-0410-96f1-a4d463321fa5