- Fixed PlanarToNV12Wrapper() and made it handle NV21.
- Added yuv2nv12XinC() to handle software scaling.
- Added NV12/NV21 handling to various places.
- Removed NV12 from vf_hue and vf_spp as they don't look like they can
actually handle it.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@14716 b3059339-0415-0410-9bf9-f77b7e298cf2