D25577: Destroy dmabuf implementation on EGL backend going down

romangg created this revision.
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REVISION SUMMARY
  We leak memory if we do not destroy the dmabuf implementation on EGL backend
  going down.
  
  Also this makes sure everything is cleaned up shutdown.
  
  BUG: 413637

TEST PLAN
  Compiles, settings change and shutdown ok.

REPOSITORY
  R108 KWin

BRANCH
  dmabuf-delete

REVISION DETAIL
  https://phabricator.kde.org/D25577

AFFECTED FILES
  linux_dmabuf.h
  platformsupport/scenes/opengl/abstract_egl_backend.cpp
  platformsupport/scenes/opengl/abstract_egl_backend.h
  platformsupport/scenes/opengl/egl_dmabuf.h

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