libsbcelt: implement helper launch throttling for rw mode.
libsbcelt: implement helper launch throttling for rw mode.

mkrautz/sbcelt,mumble-voip/sbcelt,SuperTux88/sbcelt,mumble-voip/sbcelt,mkrautz/sbcelt,SuperTux88/sbcelt,mumble-voip/sbcelt,mkrautz/sbcelt,mkrautz/sbcelt,mumble-voip/sbcelt,SuperTux88/sbcelt,SuperTux88/sbcelt