Allows you to use the $GLOBALS['TL_HOOKS']['initializeSystem'] Hook on Contao 2.11 and 3.0.
On Contao 3.1 or newer, the initializeSystem
Hooks is called immediately before the initconfig.php is included, at the near end of the initialize.php.
This backport use an autoloader injection and will be loaded when the RequestToken class get loaded
in the mid of the initialize.php. That means, that the timezone is not set, TL_PATH is not defined and no $GLOBALS['TL_LANGUAGE'] is set!
When you use this backport, you need to deal with this limitation ;-)