D9330: Fix cmake warning (with cmake >= 3.9.0)

[David Faure]

dfaure requested changes to this revision.
dfaure added a comment.
This revision now requires changes to proceed.


  Why not do this in ECM?
  
  This comment seems to come from KDE apps or something, which depend on old ECM. But KF5.42 depends on ECM5.42, so I don't see the usefulness.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D9330

To: mlaurent, dfaure
Cc: #frameworks
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