D18822: Fix Windows build [hopefully]

[Albert Astals Cid]

aacid added subscribers: vonreth, kossebau.

REPOSITORY
  R283 KAuth

REVISION DETAIL
  https://phabricator.kde.org/D18822

To: aacid
Cc: kossebau, vonreth, kde-frameworks-devel, michaelh, ngraham, bruns