functions.php

/**
 * The function that extends the default quicklink options
 *
 * @param  array $options The default Quicklink options.
 *
 * @return array          The extended Quicklink options
 */
function my_extended_quicklink_options( $options ) {

	// Do not preload 'add to wishlist' links.
	$new_options[] = preg_quote( 'add-to-wishlist=', '/' );

	// Remove possible empty strings and duplicates from the array.
	$wc_ignores = array_unique( array_filter( $new_options ) );

	$options['ignores'] = array_merge( $options['ignores'], $new_options );

	return $options;
}
add_filter( 'quicklink_options', 'my_extended_quicklink_options' );