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Fix EGLStream texture pixel downloading

Jonas Ådahl requested to merge jadahl/mutter:wip/eglstream-get-data-offscreen into master

Quoting the most relevant commit:

EGLStream textures are imported as GL_TEXTURE_EXTERNAL_OES and reading pixels directly from them is not supported. To make it possible to get pixels, create an offscreen framebuffer and paint the actor to it, then read pixels from the framebuffer instead of the texture directly.

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