live555: 2016.02.09 -> 2018.02.12

Semi-automatic update. These checks were performed:

- built on NixOS
- found 2018.02.12 with grep in /nix/store/j71f4ma9pvna3bjm3baiybspdkvnsla2-live555-2018.02.12
- found 2018.02.12 in filename of file in /nix/store/j71f4ma9pvna3bjm3baiybspdkvnsla2-live555-2018.02.12