ld.so.conf seems to have changed to include /etc/ld.so.conf.d/*.conf.
Unfortunately, proprietary drivers like the NVIDIA installed a file without the .conf extension. Therefore XOrg did not find the custom openGL library included by the driver.
Tracked as bug 718734.
home:dmacvicar:branches:X11:Drivers:Video contains a fixed nvidia-gfxG02 (Also updated to 280.13).