D29147: Revert workarounds to allow building with Qt 5.12

zzag created this revision.
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REVISION SUMMARY
  This reverts commit d18449c74327a8883ce0d7a80592255dbc70e864 <https://phabricator.kde.org/R108:d18449c74327a8883ce0d7a80592255dbc70e864>.
  
  Revert "Qt 5.12, qhash"
  
  This reverts commit 59ad852c02248857594301782449a168c5ecc627 <https://phabricator.kde.org/R108:59ad852c02248857594301782449a168c5ecc627>.
  
  Revert "More for Qt 5.12"
  
  This reverts commit 3e9f33bb3e58f03d200a628e48e9ca745628502e <https://phabricator.kde.org/R108:3e9f33bb3e58f03d200a628e48e9ca745628502e>.
  
  Revert "Allow building with Qt 5.12"
  
  This reverts commit 54c6acadf2d46518d77bb1c44c6710970c9b1500 <https://phabricator.kde.org/R108:54c6acadf2d46518d77bb1c44c6710970c9b1500>.

TEST PLAN
  Builds.

REPOSITORY
  R108 KWin

BRANCH
  revert-fix-compiler-warnings

REVISION DETAIL
  https://phabricator.kde.org/D29147

AFFECTED FILES
  libkwineffects/kwinglplatform.cpp
  plugins/platforms/drm/drm_backend.cpp
  plugins/platforms/x11/standalone/glxbackend.cpp
  wayland_server.cpp

To: zzag, #kwin
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