[packman] duplicate packages to remove from PMBS because they are in OBS

[Olaf Hering]

There are some applications in PMBS which are also available from OBS.
While some do require ffmpeg/etc for building, others are just still in
PMBS for historical reasons. Examples are Extras/kim, Extras/freeswitch

Any objection to remove such packages or enable them only for
SLE/Evergreen? Ideally these packages should just _link to OBS.

Olaf