RFR(S): 8173147: [ctw] fails during compilation of sun.security.krb5.internal.crypto.RsaMd5DesCksumType::calculateKeyedChecksum with " graph should be schedulable"

[Roland Westrelin]

> Your fix looks good to me. Thanks for taking care of this!
>
> I can sponsor as soon as our test infra is up again.

Thanks for the review and offering to sponsor.

Roland.