[packman] Leap 16.0 and switch to gitea

[Luigi Baldoni]

  Greetings fellow packmen,
the Leap 16.0 packages are now being mirrored thanks to Marc Schiffbauer, but I've noticed that the uncrippled versions of the ffmpeg libraries are missing.
Problem is, it's no longer possible to link to the relevant OBS package since development for Leap 16/SLFO has moved to src.opensuse.org

So, I guess what PMBS needs is to add/enable scmsync support and do like OBS does or we won't be able to use any patent-encumbered codec.

Not sure who's the person who could do this (possibly Stefan Botter?), so I'm leaving this as an open letter.

Regards