urbi-root: simpler OS-dependency.
urbi-root: simpler OS-dependency.

	* src/liburbi/urbi-root.cc (APPLE_LINUX_WINDOWS): New.
	Use it.

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