[libguac/f18] (3 commits) ...Merge branch 'master' into f18

[Simone Caronni]

Summary of changes:

  47f297f... Change Source0 URL (*)
  4c60146... Update to 0.6.3 (*)
  9307d08... Merge branch 'master' into f18

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