D8339: Drop pre Qt5.9 changes

[David Edmundson]

davidedmundson created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

TEST PLAN
  Compiles

REPOSITORY
  R120 Plasma Workspace

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

AFFECTED FILES
  applets/appmenu/lib/appmenuapplet.cpp
  applets/notifications/plugin/thumbnailer.cpp
  applets/systemtray/systemtray.cpp

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