RFR: 8356645: Javac should utilize new ZIP file system read-only access mode [v2]

[David Beaumont]

On Wed, 11 Jun 2025 05:48:24 GMT, Jan Lahoda <jlahoda at openjdk.org> wrote:

>> This seems like a fallback path, so don't think we should add a no-arg version to promote skipping the release version.
>
> I think just `readOnlyJarFSEnv(null)` is OK.

Left it using `readOnlyJarFSEnv(null)`

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PR Review Comment: https://git.openjdk.org/jdk/pull/25639#discussion_r2155421915