Remove unneeded target dependency

The target is not available in newer FairMQ versions.

added Build System label

requested review from @p.-a.loizeau

assigned to @p.-a.loizeau

Dear @f.uhlig, @p.-a.loizeau, @n.herrmann, @i.deppner, @v.friese,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

approved this merge request

merged