D19921: RFC: Fix wayland backend initialisation

apol created this revision.
apol added a reviewer: KWin.
Herald added a project: KWin.
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REVISION SUMMARY
  Otherwise it thinks outputs couldn't be created and it leaves.
  Problem is that after this fix it crashes when it actually does things with:
  kwin_wayland: /home/apol/devel/frameworks/kwin/composite.cpp:646: void KWin::Compositor::aboutToSwapBuffers(): Assertion `!m_bufferSwapPending' failed.

TEST PLAN
  As said, it proceeds correctly and crashes elsewhere

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D19921

AFFECTED FILES
  plugins/platforms/wayland/egl_wayland_backend.cpp

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