Use new python package configuration

cmake/modules/GeneratedSystemtests.cmake

@@ -180,7 +180,7 @@ function(dune_add_formcompiler_system_test)
         add_dependencies(build_${label}_tests ${tname})
       endforeach()
 
-      _add_test(NAME ${tname}
+      dune_add_test(TARGET ${tname}
                 COMMAND ${CMAKE_BINARY_DIR}/run-in-dune-env ${SYSTEMTEST_SCRIPT}
                 --exec "$<TARGET_FILE_DIR:${tname}>/$<TARGET_FILE_NAME:${tname}>"
                 --ini "${CMAKE_CURRENT_BINARY_DIR}/${inifile}"