fdo#67060 do not package RPM-only install script to DEB packs

Change-Id: I90c74f0d00804b80daeca2c69d1f12e094243a81
Reviewed-on: https://gerrit.libreoffice.org/6734
Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>