Ticket 48825 - Configure make generate invalid makefile
    
    Bug Description:  In some cases it was possible for configure to generate an
    invalid makefile. This was in the case that systemd was enabled,
    
    Fix Description:  Remove the optional test around the groupname check. It should
    always have a default.
    
    https://fedorahosted.org/389/ticket/48825
    
    Author: wibrown
    
    Review by: mreynolds (Thanks!)