D7843: Move XFixes cursor change tracking into the x11 standalone platform

[Martin Flöser]

graesslin edited the test plan for this revision.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D7843

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