D5392: Fix build with Qt 5.9

[Kevin Funk]

kfunk accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R313 KHtml

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5392

To: apol, #frameworks, kfunk
Cc: mpyne, ltoscano, #frameworks