Ticket 48418 - 389-admin - remove USE_64 as its not needed
    
    Description:  The USE_64 variable is no longer needed.
    
                  Original patch provided by:
                    Marcin Juszkiewicz <mjuszkiewicz@redhat.com> (Thanks!)
    
    https://fedorahosted.org/389/ticket/48418
    
    Reviewed by: mreynolds