D8706: Fix build with a KWindowSystem framework that doesn't pull QWidget

[Aleix Pol Gonzalez]

apol created this revision.
apol added a reviewer: Plasma.
Restricted Application added a project: KWin.
Restricted Application added subscribers: KWin, kwin, plasma-devel.

REVISION SUMMARY
  Fixes the build with https://phabricator.kde.org/D8705

TEST PLAN
  Just adds includes, I wonder if it should go into Plasma/5.8 and /5.11 too

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8706

AFFECTED FILES
  effects/coverswitch/coverswitch.cpp
  effects/coverswitch/coverswitch.h
  effects/cube/cube.h
  effects/flipswitch/flipswitch.h
  effects/mouseclick/mouseclick.h
  effects/presentwindows/presentwindows.h
  effects/showfps/showfps.cpp
  effects/showfps/showfps.h
  effects/slidingpopups/slidingpopups.cpp
  libkwineffects/kwineffects.h

To: apol, #plasma
Cc: plasma-devel, kwin, #kwin, bwowk, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart
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