Merge remote-tracking branch 'remotes/kraxel/tags/opengl-20171017-pull-request' into...

ui: opengl updates for dma-buf support.

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* remotes/kraxel/tags/opengl-20171017-pull-request:
  egl-headless: add dmabuf support
  egl-helpers: add egl_texture_blit and egl_texture_blend
  egl-helpers: add dmabuf import support
  opengl: add flipping vertex shader
  opengl: move shader init from console-gl.c to shader.c
  console: add support for dmabufs

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --cc Makefile
Simple merge

diff --cc ui/gtk-gl-area.c
Simple merge