Nouveau Kepler Re-Clocking Is Working A Lot Better On Linux 4.4

With the open-source Tesseract game, there wasn't too much of a performance difference but still a nice change. With the 0a state on the GTX 780 Ti, it reached the highest core clock frequency while the GDDR5 memory frequency was set to 1620MHz rather than 7000MHz. With 0f, the video memory frequency is tapped out.

With Unigine Valley there also wasn't too much of a performance difference as the GTX 780 Ti performance on the Nouveau driver doesn't seem to be limited by video memory speed for this test.

The performance boosts were also small for Xonotic.