RFR: 7903604: Provide Build.java to (eventually) replace `build.sh`

[Jonathan Gibbons]

On Thu, 11 Apr 2024 16:05:08 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> IIRC, it was rounding up from a bug fix required in a JDK 11 update.
>
> I'll investigate the current requirements.

Also, we should differentiate between the version used to _build_ `jtreg` from the version required to _run_ it.

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PR Review Comment: https://git.openjdk.org/jtreg/pull/177#discussion_r1561298444