Ported a couple more methods to XS

xs/src/libslic3r/Print.hpp

@@ -206,6 +206,7 @@ class Print
     void _simplify_slices(double distance);
     double max_allowed_layer_height() const;
     bool has_support_material() const;
+    void auto_assign_extruders(ModelObject* model_object) const;
     
     private:
     void clear_regions();