RFR: 8311302: Allow for jlinking a custom runtime without packaged modules being present [v23]

[Severin Gehwolf]

On Thu, 21 Mar 2024 15:35:06 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

>> Ok, fine. Will the new solution still include a build-time only tool?
>
> Yes, but I'll likely go with the interim solution and that would only require the a single "driver" class in the build tree with a `main` method.

Now it's no longer a module, since no jlink plugin is being used any more.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14787#discussion_r1551545310