mesa: use _mesa_set_varying_vp_inputs before building ff frag
What does this MR do and why?
mesa: use _mesa_set_varying_vp_inputs before building ff frag
Fixed func fragment program depends on ctx->VertexProgram._VaryingInputs so make sure it's up to date before calling _mesa_get_fixed_func_fragment_program.
Fixes: c97961a8 ("mesa: fix 38% decrease in display list performance of Viewperf2020/NX8_StudioAA") Closes: #9441 (closed)