urbi-launch: use EX_OSFILE.
urbi-launch: use EX_OSFILE.

	* src/liburbi/urbi-root.cc (xdlopen): Take care of
	LIBPORT_LIBSFX here.
	Adjust callers.
	Take the exit status as argument.
	Use it to restore the special case for libuobject.

aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi