[jdk21u-dev] RFR: 8324577: [REDO] - [IMPROVE] OPEN_MAX is no longer the max limit on macOS >= 10.6 for RLIMIT_NOFILE

[Martin Doerr]

Clean backport of [JDK-8324577](https://bugs.openjdk.org/browse/JDK-8324577).

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Commit messages:
 - Backport f1d0e715b67e2ca47b525069d8153abbb33f75b9

Changes: https://git.openjdk.org/jdk21u-dev/pull/640/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=640&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324577
  Stats: 17 lines in 1 file changed: 9 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/640.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/640/head:pull/640

PR: https://git.openjdk.org/jdk21u-dev/pull/640