RPM: Do not define unused variables on RHEL8
RPM: Do not define unused variables on RHEL8

* It seems OBS recently started hating these, because they are not
  defining concrete versions, and fails therefore, however these
  variables are not used, so lets just guard their definition.

kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka