Workaround of some buildroot failure and ffmpeg

There are still some issues with buildroot, some of theses are - ffmpeg is broken in rawhide. probably because of some header changes with opencv. There is a need for someone to look into for a real fix. - Missing buildroot dependencies. This is a known issue with koji when using external repos (for fedoras package), I can only say that this is a known issue and here is the suggested fix: https://bugzilla.rpmfusion.org/show_bug.cgi?id=3024 The workaround still need to be implemented, but it won't work as fine as on the pre-infra where I was the only one to submit build job (and kick a new createrepo task if there are any failure). - Errror with groupadd, should be workarounded, (origial bugzilla is https://bugzilla.redhat.com/show_bug.cgi?id=1060811) - rfpkg needs to be removed from the default buildroot and use rfpkg-minimal instead. This is a simple task that anyone can take. (convert and create rfpkg-minimal rpm package based on fedpkg-minimal) Don't forget that you need rfpkg-1.23.4 from koji.rpmfusion.org to submit build correctly. I will push them before this week-end (hopefully with ffmpeg fixed for rawhide). Thx -- - Nicolas (kwizart)