RFR: 8331081: 'internal proprietary API' diagnostics if --system is configured to an earlier JDK version

[Liam Miller-Cushon]

On Thu, 2 May 2024 21:18:36 GMT, Liam Miller-Cushon <cushon at openjdk.org> wrote:

> > On the code level, I would suggest to re-organize the code so that user packages would not accumulate in `supplementaryFlags` - that seems unnecessary. If the module owning `c` is neither `noModule` nor `jdk_unsupported`, there's no point in putting anything in the map the computation, I think. (Not too terrible, but some user programs use a lot of packages.)
> 
> Thanks, I can clean that up.

Done

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PR Comment: https://git.openjdk.org/jdk/pull/19069#issuecomment-2112096509