QSV: use MFX_IMPL_AUTO_ANY.

This is the recommended usage.

Also, it may fix cases where Quick Sync Video is detected as available but fails to initialize when encoding.



git-svn-id: svn://svn.handbrake.fr/HandBrake/branches/qsv@5643 b64f7644-9d1e-0410-96f1-a4d463321fa5
QSV: enc_qsv: improve B-frame usage detection.



git-svn-id: svn://svn.handbrake.fr/HandBrake/branches/qsv@5644 b64f7644-9d1e-0410-96f1-a4d463321fa5