[jdk21u] RFR: 8317803: Exclude java/net/Socket/asyncClose/Race.java on AIX

[Christoph Langer]

Hi all,

This pull request contains a backport of [JDK-8317803](https://bugs.openjdk.org/browse/JDK-8317803), commit [1161e3da](https://github.com/openjdk/jdk/commit/1161e3da14dde739aa6d76bba082662babb8d2d8) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

It is a test exclusion for AIX, applies clean.

Thanks!

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Commit messages:
 - Backport 1161e3da14dde739aa6d76bba082662babb8d2d8

Changes: https://git.openjdk.org/jdk21u/pull/241/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=241&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317803
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u/pull/241.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/241/head:pull/241

PR: https://git.openjdk.org/jdk21u/pull/241