D28171: Fix build with Qt 5.15

[Laurent Montel]

mlaurent accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R34 Marble

REVISION DETAIL
  https://phabricator.kde.org/D28171

To: arojas, #kde_edu, #marble, mlaurent
Cc: marble-devel, kde-edu, fbampaloukas, torhamzed, jalvarez, mnafees, shentey, chaz6, dkolozsvari, narvaez, cmihalache, rahn, apol, nienhueser
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