Method createExtensionRoot

/**
 * Method to create the extension root path if necessary
 *
 * @return  void
 *
 * @since   3.4
 * @throws  \RuntimeException
 */
protected function createExtensionRoot()
{
    /*
     * For packages, we only need the extension root if copying manifest files; this step will be handled
     * at that point if necessary
     */
}