V4L2: Create README.md
V4L2: drop version number from libc filename

Signed-off-by: Antti Palosaari <crope@iki.fi>
V4L2: Update install instructions

Signed-off-by: Antti Palosaari <crope@iki.fi>
V4L2: use 16bit format and LUT

Use 16bit sample format and LUT for conversion.

Signed-off-by: Antti Palosaari <crope@iki.fi>
V4L2: use standard method to find libc

libc.so.6 is standard library which is found automatically if it
exists and name is correct. Currently name is libc.so.6 and it will
not change anytime soon.

Signed-off-by: Antti Palosaari <crope@iki.fi>