Function emscripten_sys::emscripten_idb_async_load

pub unsafe extern fn emscripten_idb_async_load(db_name: *const c_char,
                                               file_id: *const c_char,
                                               arg: *mut c_void,
                                               onload: em_async_wget_onload_func,
                                               onerror: em_arg_callback_func)