Bug#799948: glx-diversions: Upgrade to version 0.6.0 made sddm-greeter crash

[Pascal Obry]

Same for me.

I confirm that reverting glx-diversion and *nvidia* from unstable to
testing fixes this issue.

> sudo apt-get install -t testing glx-alternative-nvidia/testing glx-diversions/testing nvidia-kernel-dkms/testing nvidia-driver/testing nvidia-driver-bin/testing xserver-xorg-video-nvidia/testing libegl1-nvidia/testing nvidia-vdpau-driver/testing libgles1-nvidia/testing libnvidia-eglcore/testing libnvidia-eglcore/testing

Didn't tried the Guy suggestion.

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