Bug#753781: Nvidia driver should be updated before the transition

[Eric Valette <eric.valette@free.fr>]

Current nvidia driver is not compatible with xorg 1.16. Probably version 
331.79 should be packaged. See bu

See following link for more details:
<https://devtalk.nvidia.com/default/topic/759191/unix-graphics-announcements-and-news/linux-solaris-and-freebsd-driver-331-89-long-lived-branch-release-/>

-- eric