[packman] ffmpeg-4 is unresolvable for Leap 42.3

[Wolfgang Bauer]

Hi!
I'm not sure who's "fault" it is, but currently ffmpeg-4 (and the associated 
libs) are still not available for Leap 42.3 on Packman.

Can this be fixed please?

I also reopened https://bugzilla.opensuse.org/show_bug.cgi?id=1102671 .

For some reason it builds fine on OBS though, so I'm not sure where the 
problem lies.

Thanks in advance.

Kind Regards,
Wolfgang