filters: Add cuda/nvdec deinterlacing auto-filter using vf_yadif_cuda

Historically, there's been no way to offer deinterlacing with nvdec,
and for cuviddec, it required a command line flag, with no way to
toggle while playing.

Now that we have a cuda deinterlacing filter in ffmpeg, we can hook
it up hook it up as the cuda auto-deinterlacer. In practice, this
isn't going to be present very often, due to the licensing mess with
the cuda sdk, but we can support it when it is there.

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