mesa,vbo: properly detect when vertex arrays need to be recalculated

mesa,vbo: properly detect when vertex arrays need to be recalculated

This moves the RebindArrays flag into the vbo module, consolidates the code,
and adds missing vbo_draw_method calls.

Also with this change, the vertex arrays are not needlessly recalculated twice.
The issue with the old code was:
- If recalculate_input_bindings updates vp_varying_inputs, _NEW_ARRAY is set.
- _mesa_update_state is called and the vp_varying_inputs change causes
  regeneration of the fixed-function shaders, which also sets _NEW_PROGRAM.
- The occurence of either _NEW_ARRAY or _NEW_PROGRAM sets
  the recalculate_inputs flag to TRUE again.
- The new code sets the flag to FALSE after the second _mesa_update_state,
  because there can't possibly be any change which would require recalculating
  the arrays.

Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Mathias Fröhlich <Mathias.Froehlich@web.de>