Prohibit the ability to check version if it was disabled.

Signed-off-by: Alexei Yuzhakov <sibprogrammer@gmail.com>

libraries/Util.class.php

@@ -4491,6 +4491,10 @@ class PMA_Util
      */
     public static function getLatestVersion()
     {
+        if (!$GLOBALS['cfg']['VersionCheck']) {
+            return array();
+        }
+
         // wait 3s at most for server response, it's enough to get information
         // from a working server
         $connection_timeout = 3;