[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-r2397-b7a50c1 (142), a stable release (was x264-r2397-aff928d before last update, forced push in x264 devel?)