D21604: Fix building with Qt 5.13

[Allan Sandfeld Jensen]

carewolf added reviewers: bruns, ngraham.

REPOSITORY
  R293 Baloo

REVISION DETAIL
  https://phabricator.kde.org/D21604

To: carewolf, bruns, ngraham
Cc: kde-frameworks-devel, #baloo, LeGast00n, domson, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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