[hylafax+/el6] For el5 and el6 jbigkit doesn't exist, so make the jbigkit-devel dependency conditional on Fedora >=

[Lee Howard]

Summary of changes:

  020c9d4... For el5 and el6 jbigkit doesn't exist, so make the jbigkit- (*)

(*) This commit already existed in another branch; no separate mail sent