Remove mysql_connect as it is marked as deprecated.

app/sql_query/sql_query_pdo.php

@@ -180,10 +180,6 @@ if ($db_type == "sqlite") {
 if ($db_type == "mysql") {
 	//database connection
 	try {
-		//required for mysql_real_escape_string
-			if (function_exists(mysql_connect)) {
-				$mysql_connection = mysql_connect($db_host, $db_username, $db_password);
-			}
 		//mysql pdo connection
 			if (strlen($db_host) == 0 && strlen($db_port) == 0) {
 				//if both host and port are empty use the unix socket