D12885: Fix build of tour-preview example

[Heiko Becker]

This revision was not accepted when it landed; it landed in state "Needs Review".
This revision was automatically updated to reflect the committed changes.
Closed by commit R34:4c3740819af0: Fix build of tour-preview example (authored by heikobecker).

REPOSITORY
  R34 Marble

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D12885?vs=34172&id=37287

REVISION DETAIL
  https://phabricator.kde.org/D12885

AFFECTED FILES
  examples/cpp/tour-preview/tour-preview.cpp

To: heikobecker
Cc: marble-devel, kde-edu, torhamzed, jalvarez, tjakobi, mnafees, shentey, chaz6, dkolozsvari, narvaez, cmihalache, rahn, apol, nienhueser
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