[qt/f16] (3 commits) ...don't spam if libicu is not present at runtime (#759923)

[Rex Dieter]

Summary of changes:

  9f74aac... fixup sources (*)
  41cb7e3... add missing method for QBasicAtomicPointer on s390(x) (*)
  76de2fc... don't spam if libicu is not present at runtime (#759923) (*)

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