RFR: 8357303: (fs) UnixSecureDirectoryStream.implDelete has unused haveFlags parameter

[Brian Burkhalter]

Remove the `haveFlags` parameter of `UnixSecureDirectoryStream.implDelete` and all code which would execute if `haveFlags` were `false`.

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Commit messages:
 - 8357303: (fs) UnixSecureDirectoryStream.implDelete has unused haveFlags parameter

Changes: https://git.openjdk.org/jdk/pull/25359/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25359&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357303
  Stats: 18 lines in 1 file changed: 0 ins; 14 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/25359.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25359/head:pull/25359

PR: https://git.openjdk.org/jdk/pull/25359