v4l2-library: libv4l2 and v4l2convert

From: Hans de Goede <j.w.r.degoede at hhs.nl>

libv4l2 offers v4l2_ prefixed versions of
   open/close/etc. The API is 100% the same as directly opening /dev/videoX
   using regular open/close/etc, the big difference is that format conversion
   is done if necessary when capturing. That is if you (try to) set a capture
   format which is not supported by the cam, but is supported by libv4lconvert,
   then the try_fmt / set_fmt will succeed as if the cam supports the format
   and on dqbuf / read the data will be converted for you and returned in
   the request format.
v4l2convert: open/close/ioctl/mmap/munmap library call wrapper doing format conversion
   for v4l2 applications which want to be able to simply capture bgr24 / yuv420
   from v4l2 devices with more exotic frame formats.

Signed-off-by: Hans de Goede <j.w.r.degoede at hhs.nl>
Signed-off-by: Thierry MERLE <thierry.merle@free.fr>

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