RFR: 8355445: [java.nio] Use @requires tag instead of exiting based on "os.name" property value

[Brian Burkhalter]

On Fri, 25 Apr 2025 06:45:06 GMT, Jaikiran Pai <jpai at openjdk.org> wrote:

> I think the change to this test is an oversight.

@jaikiran You are correct. Thanks for catching this mistake. I will revert that change to `StreamTest`.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24861#discussion_r2060517220