[qt/f15] (3 commits) ...drop old/unused patches

[Rex Dieter]

Summary of changes:

  15b71d3... update to 4.7.3 (*)
  8517c08... QTBUG-18338 already fixed in 4.7.3 (*)
  5cccbd3... drop old/unused patches (*)

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