[macchanger/f19] (4 commits) ...Fix fromat string to fix build with -Werror

[thoger]

Summary of changes:

  1032622... - Rebuilt for https://fedoraproject.org/wiki/Fedora_21_Mass (*)
  5941539... Update to macchanger 1.7.0 (*)
  8206ac1... Build package with -Werror (*)
  986252c... Fix fromat string to fix build with -Werror (*)

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