Packaging changes:
- Cleaned up builddeps:
- Removed mpg123 - it wasn't used by mpv since 0.9.0 (see commit).
- Removed x11 - it's pulled in by other X11 dependencies.
- Changed some pkgconfigs to better show which libs are being used (gl -> gbm, libturbojpeg -> libjpeg, libva-x11 -> libva)
- Switched to LuaJIT for better performance of Lua scripts and rewrote patch for bash completions accordingly.
- Added rubberband support for high-quality pitch correction.