修正real_connect传参

62行少传了`socket`参数，导致`$flags`实际上被传给了`socket`

lib/class.mysqli.php

@@ -59,7 +59,7 @@ public function __construct($host, $user, $pw, $name, $long = false, $useSSL = f
             if ($long) {
                 $host = 'p:' . $host;
             }
-            $connected = $mysqli->real_connect($host, $user, $pw, $name, null, $flags);
+            $connected = $mysqli->real_connect($host, $user, $pw, $name, null, null, $flags);
         } else {
             if ($long) {
                 $connected = $mysqli->real_connect('p:' . substr($host, 0, $coninfo), $user, $pw, $name, substr($host, $coninfo + 1), null, $flags);