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

This reverts commit 5003ab57eee903d072fc7fac8cb5c69a34fb9d5c.
It did not work, when both RPM and DEB were selected as targets.

Change-Id: I90c74f0d00804b80daeca2c69d1f12e094243a81