D5450: Drop unneccessary dep on WindowSystem

[Heiko Becker]

heikobecker created this revision.
Restricted Application added a project: KDE PIM.

REPOSITORY
  R201 Akregator

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5450

AFFECTED FILES
  CMakeLists.txt

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