D11423: Fix build with Qt 5.11 (missing headers)

[Daniel Vrátil]

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

REPOSITORY
  R173 KCalendar Utils

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D11423

To: asturmlechner, mlaurent, dvratil
Cc: #kde_pim, dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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