D25821: Fix build on Qt 5.14

[Aleix Pol Gonzalez]

apol abandoned this revision.

REPOSITORY
  R165 Akonadi

REVISION DETAIL
  https://phabricator.kde.org/D25821

To: apol, #kde_pim
Cc: ognarb, kde-pim, fbampaloukas, dcaliste, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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