What's done:
- ffmpeg build added to OpenSuse platforms
- installing of yasm moved to packages install file in
order to get rid of OS checkings
Pick-to: 6.5
Change-Id: I256f19a03e7f01d27923b083b63d9a6b6a5f29b4
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
Reviewed-by: Lars Knoll <lars@knoll.priv.no>