urbi-root: remove incorrect OS X work around.
urbi-root: remove incorrect OS X work around.

	* src/liburbi/urbi-root.cc (UrbiRoot::UrbiRoot): Don't load
	libSystem.B, the loader does it.

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