RFR: 8355445: [java.nio] Use @requires tag instead of exiting based on "os.name" property value [v2]

[Brian Burkhalter]

> Use the `@requires` tag instead of obtaining the operating system name from the `os.name` property and then exiting if the test is not run on that operating system.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8355445: Revert erroneous change to StreamTest

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24861/files
  - new: https://git.openjdk.org/jdk/pull/24861/files/67029a5e..87eafb1f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24861&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24861&range=00-01

  Stats: 11 lines in 1 file changed: 2 ins; 1 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/24861.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24861/head:pull/24861

PR: https://git.openjdk.org/jdk/pull/24861