EXFLAG_CRITICAL
x->ex_flags |= EXFLAG_CRITICAL;
if ((crl->flags & EXFLAG_CRITICAL) == 0)
&& (crl->flags & EXFLAG_CRITICAL) != 0 && !verify_cb_crl(ctx, X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION))
&& (x->ex_flags & EXFLAG_CRITICAL) != 0,
crl->flags |= EXFLAG_CRITICAL;
crl->flags |= EXFLAG_CRITICAL;