Update Makefile

examples/Makefile

@@ -575,6 +575,7 @@ SHAPES = \
     shapes/shapes_easings_box \
     shapes/shapes_easings_rectangles \
     shapes/shapes_following_eyes \
+    shapes/shapes_hilbert_curve \
     shapes/shapes_kaleidoscope \
     shapes/shapes_lines_bezier \
     shapes/shapes_lines_drawing \