[Plugin: Role Scoper] PHP Warning: mysql_get_server_info() expects parameter 1 to be resource

this error is present in the latest version of the plugin

it appears that around line 197 of role-scoper.php the following code is present which appears to be now deprecated in WP (https://core.trac.www.ads-software.com/ticket/11443)

the offending code is:

} else {
 ? ? ?if ( ! $wpdb->has_cap( 'subqueries' ) ) {
 ? ? ? ? ? ? ?rs_notice('Sorry, this version of Role Scoper requires a database server that supports subqueries (such as MySQL 4.1+). ?Please upgrade your server or deactivate Role Scoper.');
 ? ? ? ? ? ? ?$bail = 1;
 ? ?}

commenting it out successfully prevents this warning

https://www.ads-software.com/extend/plugins/role-scoper/