Revert "Remove unused KF5 dependencies"
Revert "Remove unused KF5 dependencies"

This reverts commit ce2a58313fbeaee6482c9718ce4dfdf5cc190875.

Rationale:

  kross/src/ui/actioncollectionview.cpp uses
  1. KComboBox from KCompletion,
  2. KMessageBox from KWidgetsAddons,
  3. KActionCollection from KXmlGui.

  KrossUi compiled without problem because some other dependencies (e.g.
  KParts) linked to these 3 libraries publicly (in the sense of CMake
  keywords PUBLIC/PRIVATE/INTERFACE).

KDE/kross,KDE/kross,KDE/kross,KDE/kross,KDE/kross,KDE/kross