[qt/f18] (3 commits) ...fix when not building with -webkit

[Rex Dieter]

Summary of changes:

  21b133a... fix/prune/changelog (*)
  a67cb02... designer-plugin-webkit subpkg (#887501) (*)
  c56c2fc... fix when not building with -webkit (*)

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