Classic Mesa OpenGL drivers (non-Gallium3D) have been removed from the code base as part of the upgrade effort. Halfway through its inception, the Mesa delete request was honored today by removing the "classic" Mesa OpenGL drivers from the code base.
Removed drivers are the old Radeon R100 and R200 drivers, the original Nouveau code, the Intel i915 and i965 drivers and some of the oldest NVIDIA graphics cards