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

[Laurent Montel]

mlaurent added a comment.


  Ok I can move it to ecm (mais in which file ?) "kde-modules/KDECMakeSettings.cmake" ?
  
  and it depends if apps have some specific macro for example in kmail we have "EXPORT_KONTACT_PLUGIN" too

REPOSITORY
  R241 KIO

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

To: mlaurent, dfaure
Cc: #frameworks
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