PDOSqlsrv's constructor breaks when using non "local" server host

Problem:

Currently, the _constructPdoDsn() for the PDOSqlsrv driver works fine only if the host provided is: local or localhost.
If using an IP address, this breaks. Reason is because _constructPdoDsn() applies ( and ) around the host.

        $dsn = 'sqlsrv:server=(';
        if (isset($params['host'])) {
            $dsn .= $params['host'];
        }
        $dsn .= ')';

This is fine for when $params['host'] = 'local'; because I believe local is a name pipe (I think) and to properly use it you need to add the brackets around it

However if $params['host'] = '127.0.0.1'; this breaks!

Fix:

Get rid of the forced brackets

        $dsn = 'sqlsrv:server=';
        if (isset($params['host'])) {
            $dsn .= $params['host'];
        }

That way, when supplying local as a host, you have to enter (local) (which makes more sense as that's how you would do it normally in other applications).