(PDB-377) Disabling JAR repacking when creating RPMS

The manipulation of the class files causes issues with AOT compiled
Clojure code, specifically around defrecords/deftypes. Disabling
repacking prevents the issue.
Merge pull request #827 from senior/ticket/1.6.x/pdb-377-fedora-jar-repacking-fix

(PDB-377) Disabling JAR repacking when creating RPMS