RFR: 8355443: [java.io] Use @requires tag instead of exiting based on File.separatorChar value

[Naoto Sato]

On Thu, 24 Apr 2025 17:20:01 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> IIUC, the test tries to create double byte path directory, so in recent jdk it should check `sun.jnu.encoding==MS932` (it still only run on Japanese Windows though)
>
> Sounds like a different issue needs to be filed.

Yeah, that sounds better.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24838#discussion_r2058915500