[jdk21u-dev] RFR: 8355444: [java.io] Use @requires tag instead of exiting based on "os.name" property value

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle.

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Commit messages:
 - Backport 5faa55902211e5ad8edc51282022ed9db3684b25

Changes: https://git.openjdk.org/jdk21u-dev/pull/2193/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2193&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8355444
  Stats: 46 lines in 6 files changed: 13 ins; 25 del; 8 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2193.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2193/head:pull/2193

PR: https://git.openjdk.org/jdk21u-dev/pull/2193