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

[T.C. Hollingsworth]

Summary of changes:

  cd42a76... add macro for EPEL6 dependency generation (*)
  095206a... invoke EPEL dependency generator macro conditionally to mak (*)
  83d86c1... restrict to compatible arches (*)

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