RFR: 8355443: [java.io] Use @requires tag instead of exiting based on File.separatorChar value [v2]

[Brian Burkhalter]

> 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")

Brian Burkhalter has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

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

-------------

Changes: https://git.openjdk.org/jdk/pull/24838/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24838&range=01
  Stats: 61 lines in 10 files changed: 10 ins; 35 del; 16 mod
  Patch: https://git.openjdk.org/jdk/pull/24838.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24838/head:pull/24838

PR: https://git.openjdk.org/jdk/pull/24838