D26694: [plugins/windowsystem] Use upstream KWINDOWSYSTEM_BUILD_DEPRECATED_SINCE

[David Faure]

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

REPOSITORY
  R108 KWin

BRANCH
  use-upstream-build-deprecated-since

REVISION DETAIL
  https://phabricator.kde.org/D26694

To: zzag, #kwin, dfaure
Cc: kwin, LeGast00n, The-Feren-OS-Dev, jraleigh, zachus, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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