D8339: Drop pre Qt5.9 changes

[Anthony Fieroni]

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

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D8339

To: davidedmundson, anthonyfieroni
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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