RFR: 8350685: java/lang/System/SecurityManagerWarnings.java fails with --enable-preview

[Sean Mullan]

Please review this fix to a test that fails when run with --enable-preview. This fix is to add all the necessary utility classes imported by the test to the JAR file, and not just the test classes.

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Commit messages:
 - Initial fix.

Changes: https://git.openjdk.org/jdk/pull/23864/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23864&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350685
  Stats: 5 lines in 1 file changed: 0 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/23864.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23864/head:pull/23864

PR: https://git.openjdk.org/jdk/pull/23864