[vlc-devel] Patch for Grayscale support

[Michael Benjamin]

Attached is a patch for grayscale support.

The V4L access module maps VIDEO_PALETTE_GREY and the ffmpeg codec module
maps PIX_FMT_GRAY8 to fourcc GREY. But no FOURCC_GREY definition existed in
src/video_output/vout_pictures.h and no FOURCC_GREY cases were present in
src/video_output/vout_pictures.c (InitFormat/InitPicture) and
modules/codec/rawvideo.c (OpenDecoder).

Also I added a FOURCC GREY case in blend.c but more work may be needed to
fully implement blending.
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