[jdk11u-dev] RFR: 8328234: Remove unused nativeUtils files

[Andrew Lu]

I backport this for parity with 11.0.25-oracle.

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Commit messages:
 - Backport dec68d7e36a9436468594416272c44a2afbece8d

Changes: https://git.openjdk.org/jdk11u-dev/pull/2736/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2736&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/jdk11u-dev/pull/2736.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2736/head:pull/2736

PR: https://git.openjdk.org/jdk11u-dev/pull/2736