[jdk17u-dev] RFR: 8286869: unify os::dir_is_empty across posix platforms

[Matthias Baesken]

8286869: unify os::dir_is_empty across posix platforms

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Commit messages:
 - Backport 9ab29b6c07d0995127ba647b2eab1c694e236661

Changes: https://git.openjdk.org/jdk17u-dev/pull/459/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=459&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8286869
  Stats: 76 lines in 4 files changed: 19 ins; 57 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/459.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/459/head:pull/459

PR: https://git.openjdk.org/jdk17u-dev/pull/459