D18594: [wayland] Drop Qt extended surface

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REVISION SUMMARY
  This is only relevant on Qt and when WlShell is used.
  This was only the case before Qt5.10.
  
  We will depend on Qt5.12 next release.
  Static Qt builds from that old typically wouldn't contain QtWayland

TEST PLAN
  Compiles. Not used in tests

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D18594

AFFECTED FILES
  shell_client.cpp
  shell_client.h
  wayland_server.cpp
  wayland_server.h

To: davidedmundson, #kwin
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