intg: Do not hardcode nsslibdir
    
    This change is needed in order to have make intgcheck-run properly
    running on opensuse systems.
    
    Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com>
    Reviewed-by: Chris Kowalczyk <ckowalczyk@suse.com>
    Reviewed-by: Michal Židek <mzidek@redhat.com>