- xcode debug builds now use --debug=std instead of --debug=max
- amongst other things, this will build ffmpeg without asserts
  and avoid an mpegvideo.c assert that seems to always trigger


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5224 b64f7644-9d1e-0410-96f1-a4d463321fa5