This gives us a *lot* more visuals, and they should be more accurate.
Some of the visuals may have been wrong before. This may enable more
OpenGL programs to behave correctly.
I also suspect libGL needs a little work to handle some of these correctly.
(cherry picked from commit 98a084ce9c455260ecdb5f8eecb67f33dbb53b69)
Add a setVisualConfigs that is called before the fbScreenInit, to setup the __GLXvisualConfigs.
(cherry picked from commit fc86f9e4482043eca76d9d7a96e166be1aabf674)