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

[Naoto Sato]

On Thu, 24 Apr 2025 00:33:20 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> For tests of the `java.io` package, instead of doing this
> 
>     public static void main(String[] args) throws Exception {
>         if (File.separatorChar != '\') {
>             /* This test is only valid on win32 systems */
>             return;
>         }
> 
> do this
> 
>    @requires (os.family == "windows")

Marked as reviewed by naoto (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/24838#pullrequestreview-2791975852