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glamor: Use render node for glamor device path where possible

msizanoen1 requested to merge msizanoen1/xserver:glamor-render-node into master

On certain system deployments, /dev/dri/card* nodes aren't directly accessible to the currently logged in user, but the display server only access it by asking systemd-logind to open the device for it. This causes the X server to fail when trying to re-open the card* device directly, causing all use of DRI3 to fail.

Fix this by using the render device path instead where possible.

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