zink: implement ARB_draw_indirect

other than the vaguely gross case of primitive restart with incompatible
draw modes and/or restart index, this is no trouble since the buffer formats
are compatible

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7191>
3 files changed