Move site system settings from variable to config.
function system_update_8047() {
update_variables_to_config('system.file', array(
'allow_insecure_uploads' => 'allow_insecure_uploads',
'file_default_scheme' => 'default_scheme',
'file_chmod_directory' => 'chmod.directory',
'file_chmod_file' => 'chmod.file',
'file_private_path' => 'path.private',
'file_temporary_path' => 'path.temporary',
));
}