Quicktime: remove backend with the old quicktime API, and keep the QTKit backend.

This means that if you have WITH_BF_QUICKTIME or WITH_CODEC_QUICKTIME enabled,
it will always use QTKit.

The old backend was only used on 32 bit OS X builds, now 32 and 64 bit builds will
give consistent input/output. On Windows or Linux quicktime isn't being used.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk@61157 954f8c5b-7b00-dc11-b283-0030488c597c