D11447: No longer export QT_QPA_PLATFORM env variable to the session

[Martin Flöser]

graesslin created this revision.
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REVISION SUMMARY
  As discussed the env variables are no longer exported. Thus Qt
  applications follow the default qpa platform they are compiled with and
  thus still function if they are packaged with a Qt without QtWayland.
  Plasma's internal processes pick the qpa platform depending on the
  session type as well as our flatpak apps.
  
  KRunner and Plasmashell are adjusted to not leak the env variable they
  set for themselves.

TEST PLAN
  Started a wayland session, verified with KWin's debug console
  that plasmashell and krunner are wayland. Launched kwrite from both plasma
  and krunner and verified that it's xcb

REPOSITORY
  R120 Plasma Workspace

BRANCH
  unset-qt-qpa-platform

REVISION DETAIL
  https://phabricator.kde.org/D11447

AFFECTED FILES
  krunner/main.cpp
  shell/main.cpp
  startkde/startplasmacompositor.cmake

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