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

[T.C. Hollingsworth]

Summary of changes:

  24ce480... add macro for EPEL6 dependency generation (*)
  5c159ff... invoke EPEL dependency generator macro conditionally to mak (*)
  6517d9c... restrict to compatible arches (*)

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