D6220: CMake: Fix CMP0058 warning when using Ninja

[Volker Krause]

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

REPOSITORY
  R216 Syntax Highlighting

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D6220

To: kfunk, vkrause, dhaumann
Cc: #frameworks
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