Update java m4 location, use AC_JAVA_OPTIONS to specify jdk location.
Update java m4 location, use AC_JAVA_OPTIONS to specify jdk location.

	* Makefile.am: search for macro in build-aux/m4.
	* src/swig/java/liburbijava.ac: use AC_JAVA_OPTIONS.

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