libsbcelt: fix child respawn on Darwin.
libsbcelt: fix child respawn on Darwin.

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