Function g_file_replace_contents_async

pub unsafe extern "C" fn g_file_replace_contents_async(
    file: *mut GFile,
    contents: *const u8,
    length: size_t,
    etag: *const c_char,
    make_backup: gboolean,
    flags: GFileCreateFlags,
    cancellable: *mut GCancellable,
    callback: GAsyncReadyCallback,
    user_data: gpointer,
)