[nodejs-uid-number/f18] (3 commits) ...restrict to compatible arches

[T.C. Hollingsworth]

Summary of changes:

  bc92bd9... add macro for EPEL6 dependency generation (*)
  d2415a3... invoke EPEL dependency generator macro conditionally to mak (*)
  1cc3f38... restrict to compatible arches (*)

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