D18514: Drop pre Qt5.12 workarounds

[David Edmundson]

davidedmundson created this revision.
davidedmundson added reviewers: Plasma, KWin.
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TEST PLAN
  None

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D18514

AFFECTED FILES
  logout-greeter/main.cpp

To: davidedmundson, #plasma, #kwin
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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