[build] Add bash script to get git repo info.
[build] Added git info processing in the configure step.
[x264] Added a script to get the most recent x264 encode library.
[build] Added bash script helper files to configure separately for gui and not-gui (e.g. CLI only)
[x264] Removed patch not used in my updates of libx264, I mantain my own cloned x264 git repo
[x264] Bump to x264-r2380-de0bc36, a stable release
[libav] bump libav, libav-v10_beta2-local