D4926: Fix cmake warning

[Marco Martin]

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

REPOSITORY
  R135 Integration for Qt applications in Plasma

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D4926

To: apol, #frameworks, mart
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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