D11434: Fix build with Qt 5.11 (missing headers)

[Andreas Sturmlechner]

asturmlechner closed this revision.

REPOSITORY
  R34 Marble

REVISION DETAIL
  https://phabricator.kde.org/D11434

To: asturmlechner, #marble, aacid
Cc: #kde_edu, narvaez, apol, marble-devel
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