[Navigation] Add some missing compile checks

modules/navigation/godot_navigation_server.cpp

@@ -1131,7 +1131,11 @@ void GodotNavigationServer::bake_from_source_geometry_data_async(const Ref<Navig
 }
 
 bool GodotNavigationServer::is_baking_navigation_mesh(Ref<NavigationMesh> p_navigation_mesh) const {
+#ifdef _3D_DISABLED
+	return false;
+#else
 	return NavMeshGenerator3D::get_singleton()->is_baking(p_navigation_mesh);
+#endif // _3D_DISABLED
 }
 
 COMMAND_1(free, RID, p_object) {

modules/navigation/godot_navigation_server_2d.cpp

@@ -222,7 +222,11 @@ void GodotNavigationServer2D::bake_from_source_geometry_data_async(const Ref<Nav
 }
 
 bool GodotNavigationServer2D::is_baking_navigation_polygon(Ref<NavigationPolygon> p_navigation_polygon) const {
+#ifdef CLIPPER2_ENABLED
 	return NavMeshGenerator2D::get_singleton()->is_baking(p_navigation_polygon);
+#else
+	return false;
+#endif
 }
 
 GodotNavigationServer2D::GodotNavigationServer2D() {}

modules/navigation/nav_mesh_generator_2d.cpp

@@ -28,6 +28,8 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
 /**************************************************************************/
 
+#ifdef CLIPPER2_ENABLED
+
 #include "nav_mesh_generator_2d.h"
 
 #include "core/config/project_settings.h"
@@ -902,3 +904,5 @@ void NavMeshGenerator2D::generator_bake_from_source_geometry_data(Ref<Navigation
 		p_navigation_mesh->add_polygon(new_polygons[i]);
 	}
 }
+
+#endif // CLIPPER2_ENABLED

modules/navigation/nav_mesh_generator_2d.h

@@ -31,6 +31,8 @@
 #ifndef NAV_MESH_GENERATOR_2D_H
 #define NAV_MESH_GENERATOR_2D_H
 
+#ifdef CLIPPER2_ENABLED
+
 #include "core/object/class_db.h"
 #include "core/object/worker_thread_pool.h"
 
@@ -98,4 +100,6 @@ public:
 	~NavMeshGenerator2D();
 };
 
+#endif // CLIPPER2_ENABLED
+
 #endif // NAV_MESH_GENERATOR_2D_H