bp_core_admin_backpat_menu()

function bp_core_admin_backpat_menu() {
	global $_parent_pages, $_registered_pages, $submenu;

	// If there's no bp-general-settings menu (perhaps because the current
	// user is not an Administrator), there's nothing to do here.
	if ( ! isset( $submenu['bp-general-settings'] ) ) {
		return;
	}

	/**
	 * By default, only the core "Help" submenu is added under the top-level BuddyPress menu.
	 * This means that if no third-party plugins have registered their admin pages into the
	 * 'bp-general-settings' menu, it will only contain one item. Kill it.
	 */
	if ( 1 != count( $submenu['bp-general-settings'] ) ) {
		return;
	}

	// This removes the top-level menu.
	remove_submenu_page( 'bp-general-settings', 'bp-general-settings' );
	remove_menu_page( 'bp-general-settings' );

	// These stop people accessing the URL directly.
	unset( $_parent_pages['bp-general-settings'] );
	unset( $_registered_pages['toplevel_page_bp-general-settings'] );
}