D18523: Fix windows build

[Kevin Funk]

kfunk added a reviewer: mlaurent.

REPOSITORY
  R459 Akonadi Contacts

REVISION DETAIL
  https://phabricator.kde.org/D18523

To: kfunk, sengels, mlaurent
Cc: kde-pim, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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