void KFileItemActions::insertOpenWithActionsTo(QAction*, QMenu*,
const QString) requires KF 5.78 while
void KFileItemActions::insertOpenWithActionsTo (QAction*, QMenu*,
const QStringList) requires KF 5.82.  For any KF version earlier, use
void KFileItemActions::addOpenWithActionsTo(QMenu*, const QString)

Fixes build on older systems after
utilities/konsole!527