This commit addresses following issues:

1. Moves package to new source - snapshotting service was deprecated in favor of VideoLAN's GitLab instance. The commit is taken from "stable" branch, also I have added a note about updates for future packagers.
2. Uses version string reported by x264 --version. For future reference - it can be determined as "0.<ABI version>.<Number of commits>".
3. Disables debug info. This option conflicts with --enable-lto flag and takes preference over it. Look at configure script and our last build log to see the configuration logic and our resulting build config where LTO is not actually used.
4. Enables --system-libx264 flag so x264 binary links with shared libx264 library. The default behavior is to build static libx264 and compile it in x264 executable to get portable binary. This reduces the size of the package due to reducing duplication of binary code.

1. Rebuilt packages:
   • avidemux
   • ffmpeg
   • gst-plugins-ugly
   • gstreamer-plugins-1.0-ugly
   • handbrake
   • obs-studio
   • vlc
2. Encoded video in H264 from Y4M using x264 executable. Checked that CPU instruction sets are properly detected and used.
3. Encoded video in H264 from VC-1 using FFmpeg and HandBrake.