Comment # 1 on bug 1194386 from Jan Engelhardt

There is nothing to do. ffmpeg changelog says:

version 3.3:
- add internal ebur128 library, remove external libebur128 dependency

And if you look at the build log:
��� osc rbl openSUSE:Factory/ffmpeg-4 standard x86_64
[   80s] Enabled filters:
[   80s] afftfilt                ebur128                 resample
��� ffmpeg -filters 2>&1|grep ebur
 ... ebur128           A->N       EBU R128 scanner.