D28117: Attempt to fix Ubuntu 16.04 build, that is using Qt 5.5.

[Jasem Mutlaq]

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

REPOSITORY
  R321 KStars

BRANCH
  bugfix__qt55_build (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D28117

To: TallFurryMan, mutlaqja
Cc: kde-edu, narvaez, apol
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