Add filter for default links for multisite installs

[fliespl]

Topic says it all. It would be great to add filter to the array of default links, as other parts are customizable either through filters or site entries in the database.

Change:

	foreach ( $default_links as $link ) {
		$wpdb->insert( $wpdb->links, $link);
		$wpdb->insert( $wpdb->term_relationships, array('term_taxonomy_id' => $blogroll_tt_id, 'object_id' => $wpdb->insert_id) );
	}

to:

	foreach ( $default_links as $link ) {
		$wpdb->insert( $wpdb->links, $link);
		$wpdb->insert( $wpdb->term_relationships, array('term_taxonomy_id' => $blogroll_tt_id, 'object_id' => $wpdb->insert_id) );
	}
	
	$default_links = apply_filters( 'wp_install_default_links', $default_links );

[SergeyBiryukov]

Default links were removed in [21500].