mesa: get rid of _math_init()

mesa: get rid of _math_init()

Only VBO uses the evaluator code so call _math_init_eval() there.

Only TNL uses the transform/translate code so call _math_init_transformation()
and _math_init_translate9) there.

This is a step toward resolving some symbol collisions between Mesa's and
gallium's x86 codegen.
Have VBO and TNL modules call _math_init_transformation()