Make "sleep(inf)" really sleep forever.
Make "sleep(inf)" really sleep forever.

In fast mode, we could be woken up by the end of time instead
of sleeping forever.

	* src/object/system.cc (sleep): Wait forever when
	"sleep(inf)" is used.

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