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renderer/native: Use shadow fb on software GL if preferred

Jonas Ådahl requested to merge jadahl/mutter:wip/shadow-fb-when-software-gl into master

If a KMS device has the DRM_CAP_DUMB_PREFER_SHADOW and a software based GL driver is used, always use a shadow fb. This will speed up read backs in the llvmpipe OpenGL implementation, making blend operations faster.

Fixes: #106 (closed)

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