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

[Martin Flöser]

graesslin added a comment.


  5.11 yes, 5.8 no

REPOSITORY
  R108 KWin

BRANCH
  master

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

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