Function gio_sys::g_settings_schema_source_new_from_directory

pub unsafe extern fn g_settings_schema_source_new_from_directory(directory: *mut c_char,
                                                                 parent: *mut GSettingsSchemaSource,
                                                                 trusted: gboolean,
                                                                 error: *mut *mut GError)
                                                                 -> *mut GSettingsSchemaSource