tgt_mcred
retval = tgt_mcred(context, client, server, client, &tgtq);
static krb5_error_code tgt_mcred(krb5_context, krb5_principal,
retval = tgt_mcred(ts->ctx, client, client, client, &tgtq);
retval = tgt_mcred(context, client, server, client, &tgtq);