D13501: Fix 'unused parameter' warnings

[David Edmundson]

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

REPOSITORY
  R127 KWayland

BRANCH
  fix-warnings

REVISION DETAIL
  https://phabricator.kde.org/D13501

To: zzag, #kwin, davidedmundson
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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