MacGui: use subq for subpixel motion estimation instead of subme. This helps avoid...

MacGui: use subq for subpixel motion estimation instead of subme. This helps avoid those string-searching issues touched on in the past two commits.

This will have to be revisited when I add a "bime" option, because that will probably conflict with what dynaflash added in the last commit to sort this problem out.

git-svn-id: svn://localhost/HandBrake/trunk@584 b64f7644-9d1e-0410-96f1-a4d463321fa5