[nodejs-tar/f19] (3 commits) ...restrict to compatible arches

[T.C. Hollingsworth]

Summary of changes:

  9de72ed... add macro for EPEL6 dependency generation (*)
  326ccbd... invoke EPEL dependency generator macro conditionally to mak (*)
  0d3e54a... restrict to compatible arches (*)

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