RFR: 8354766: Test TestUnexported.java javac build fails

[SendaoYan]

Hi all,

The newly added test jdk/javadoc/doclet/testUnexported/TestUnexported.java javac build fails. This PR add depedencies to make javac build success. Test-fix only, change has been verified locally, no risk.

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Commit messages:
 - 8354766: Test TestUnexported.java javac build fails

Changes: https://git.openjdk.org/jdk/pull/24673/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24673&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354766
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24673.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24673/head:pull/24673

PR: https://git.openjdk.org/jdk/pull/24673