[Cin] another 10 bit encoding patch

you need to reset your git tree, something like git reset --hard 2037bf63cdf25462ca606f4a28636e12df77c2a0 before applying this patch then run cin like CIN_10BIT_ENC=p010le bin/cin or replace p010le with whatever equivalents y210le (?) sorry, I just hanged my X session so can't copy/paste exact output, but if you launch cingg with error=debug in bin/ffmpeg/encode.opts it will print list of accepted by vaapi library formats at encoding attempt. I think this is still more like prototype to see if we can get it working, I hope to wire it to existing profile reading mechanism.