D27997: Fix cmake warning

[Albert Astals Cid]

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

REPOSITORY
  R309 KService

BRANCH
  warning

REVISION DETAIL
  https://phabricator.kde.org/D27997

To: apol, #frameworks, aacid
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns
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