Possible to hide "Rewrite rules must be updated" message on nginx?

I’m actually already using that, more or less, although removing the priority didn’t make a difference from the one I already had:

// Remove annoying index.php in permalinks settings with Nginx.
add_filter( 'got_rewrite', '__return_true', 999 );

// For compatibility with several plugins and nginx HTTPS proxying schemes
if ( empty( $_SERVER[ 'HTTPS' ] ) || 'off' == $_SERVER[ 'HTTPS' ] ) {
    unset( $_SERVER[ 'HTTPS' ] );
}

WPSC still displays the mod rewrite message despite that.