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renderer-native: Actually use shadow fb when using software rendering

Jonas Ådahl requested to merge jadahl/mutter:wip/actually-force-shadow-fb into master

The commit 'renderer/native: Use shadow fb on software GL if preferred' attempted to force using a shadow fb when using llvmpipe in order to speed up blending, but instead only did so when llvmpipe AND the drm device explicityl asked for it.

Now instead always force it for llvmpipe and other software rendering backends, and otherwise just query the drm device (i.e. DRM_CAP_DUMB_PREFER_SHADOW).

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