Fix bug of _find_shape_in_pos(). It can not find a correct shape for a specified point. Since it call _shape_pos_is_in_cairo() directly, cairo_new_path() is not called to clear path after each calling for a shape. So, old path would interference later testing. It should call _shape_pos_is_in() instead of _shape_pos_is_in_cairo().

include_HEADERS = 	\
	mb_animate.h 	\
	mb.h	 	\
	mb_timer.h 	\
	mb_types.h 	\
	mb_observer.h	\
	mb_paint.h	\
	mb_redraw_man.h	\
	mb_shapes.h	\
	mb_tools.h	\
	mb_prop.h	\
	mb_X_supp.h	\
	mb_img_ldr.h    \
	mbapp.h         \
	animated_menu.h \
	mbbutton.h      \
	mb_so.h