D9321: Fix another CMake CMP0071 warning

[David Faure]

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

REPOSITORY
  R216 Syntax Highlighting

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9321

To: kfunk, mlaurent, dfaure
Cc: #frameworks
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