[hplip/f13/master] (3 commits) ...Use python_sitearch macro throughout.

[Tim Waugh]

Summary of changes:

  f607a37... Avoided another macro in comment. (*)
  d5c872f... Merge branch 'f12' into f13
  610a682... Use python_sitearch macro throughout.

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