D28307: Fix build of KGantt

[Dag Andersen]

danders added a comment.


  Ummpf, my mistake, it is the GraphicsItem that needs exporting.

REPOSITORY
  R478 KDiagram: Libraries for diagrams

REVISION DETAIL
  https://phabricator.kde.org/D28307

To: apol, #frameworks
Cc: danders