D28307: Fix build of KGantt

[Aleix Pol Gonzalez]

apol created this revision.
apol added a reviewer: Frameworks.
apol requested review of this revision.

REVISION SUMMARY
  My compiler doesn't like exporting namespaces.

TEST PLAN
  Builds now

REPOSITORY
  R478 KDiagram: Libraries for diagrams

BRANCH
  master

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

AFFECTED FILES
  src/KGantt/kganttgraphicsitem.h

To: apol, #frameworks
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