D6021: Fix build on Windows

[Daniel Vrátil]

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

REPOSITORY
  R165 Akonadi

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D6021

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