CONFIGURE: explicitly require GETTEXT version
    
    This is required by `autopoint` executed by `autoreconf`
    
    Resolves: https://github.com/SSSD/ding-libs/issues/8
    
    Reviewed-by: Pawel Polawski <ppolawsk@redhat.com>
    Reviewed-by: Sumit Bose <sbose@redhat.com>