D7894: Only try creating X11 shadow if we have an X11 connection

[David Edmundson]

davidedmundson accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R108 KWin

BRANCH
  shadow-x11

REVISION DETAIL
  https://phabricator.kde.org/D7894

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