RFR: 8311302: Allow for jlinking a custom runtime without packaged modules being present [v10]

[Severin Gehwolf]

On Thu, 30 Nov 2023 17:22:49 GMT, Mandy Chung <mchung at openjdk.org> wrote:

>> Happy to change the prefix. Having a (unique) prefix seems useful, though, since it eases filtering. Note: that file is not only there for the hash sums, but also to keep track of the path to the files in the filesystem, which we'd otherwise not know.
>
> Will see how a few suggested renames looks like and a better term to describe this may come out 😄 `runlink` is a bit confusing.

I just went with `fs` for `filesystem`. E.g. `fs_java.base_files` for `java.base`. Those files are taken from the filesystem so this naming makes some sense to me.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14787#discussion_r1414398799