libv4l: 1.12.3 -> 1.14.2

Semi-automatic update generated by https://github.com/ryantm/nix-update tools. These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 1.14.2 with grep in /nix/store/rbajjyaiyj3q7lxnxs1j3sn1j5x5qgpp-v4l-utils-1.14.2
- directory tree listing: https://gist.github.com/2bfaf54c93c6f29802c6049289a7bf94