D28900: Fix wayland scanner warnings

[David Edmundson]

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

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D28900

To: apol, #build_system, #kwin, #frameworks, davidedmundson
Cc: kde-frameworks-devel, kde-buildsystem, LeGast00n, cblack, bencreasy, michaelh, ngraham, bruns
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