D11430: Fix build with Qt 5.11 (missing headers)

[Albert Astals Cid]

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

REPOSITORY
  R341 Step

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D11430

To: asturmlechner, #kde_edu, aacid
Cc: narvaez, apol
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