D11430: Fix build with Qt 5.11 (missing headers)

[Andreas Sturmlechner]

asturmlechner created this revision.
asturmlechner added a reviewer: KDE Edu.
Restricted Application added a project: KDE Edu.
asturmlechner requested review of this revision.

REPOSITORY
  R341 Step

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D11430

AFFECTED FILES
  step/gascreationdialog.cc
  step/mainwindow.cc
  step/softbodygraphics.cc

To: asturmlechner, #kde_edu
Cc: narvaez, apol
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