D18488: Apply -Wno-inconsistent-missing-override for all compilers

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REVISION SUMMARY
  Default CXX flags are out of our control. Whether they're set by the
  compiler or the user or ECM.
  
  We currently disable for clang. This patch also disables this warning
  for other compilers.
  
  This might not be anyone's first preference, but we're at an impasse
  there.

TEST PLAN
  Compiled

REPOSITORY
  R108 KWin

BRANCH
  origin-master (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D18488

AFFECTED FILES
  CMakeLists.txt

To: davidedmundson, #kwin
Cc: kwin, jraleigh, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart