[jdk21u-dev] RFR: 8328234: Remove unused nativeUtils files

[Andrew Lu]

I backport this for parity with 21.0.5-oracle.

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Commit messages:
 - Backport dec68d7e36a9436468594416272c44a2afbece8d

Changes: https://git.openjdk.org/jdk21u-dev/pull/650/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=650&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328234
  Stats: 74 lines in 2 files changed: 0 ins; 74 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/650.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/650/head:pull/650

PR: https://git.openjdk.org/jdk21u-dev/pull/650