D26642: [plugins/windowsystem] Fix compilation with no-deprecated build of KWindowSystem

zzag created this revision.
zzag added a reviewer: KWin.
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REVISION SUMMARY
  This change ensures that KWin can be built with a version of KWS that
  doesn't have any deprecated stuff. I assume that no distro ships such
  builds of KWS and it's only a developer thing.
  
  I didn't backport KWINDOWSYSTEM_BUILD_DEPRECATED_SINCE macro because
  the next release of Plasma (5.18) depends on KF 5.66.

REPOSITORY
  R108 KWin

BRANCH
  fix-no-deprecated-build

REVISION DETAIL
  https://phabricator.kde.org/D26642

AFFECTED FILES
  plugins/windowsystem/windoweffects.cpp
  plugins/windowsystem/windoweffects.h

To: zzag, #kwin
Cc: kwin, iasensio, 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