nvidia_x11: maintenance+security updates

It's supposed to fix GLX problems CVE-2014-8298, see:
http://nvidia.custhelp.com/app/answers/detail/a_id/3610

Tested building all atop 14.12, and running 340.* there.

(cherry picked from commit 5a4feadd588d770d81df1aa8edd9199247d2a7de)