krb5int_cc_getops
krb5int_cc_getops(krb5_context, const char *, const krb5_cc_ops **);
err = krb5int_cc_getops(context, pfx, &ops);
err = krb5int_cc_getops(context, type, &ops);
err = krb5int_cc_getops(context, type, &ops);