RFR: 8374178: Missing include in systemDictionary.cpp after JDK-8365526

[Jie Fu]

Hi all,

Please review this tiny fix of missing include in systemDictionary.cpp.
For how to reproduce the error, please see the JBS.

Thanks.

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Commit messages:
 - 8374178: Missing include in systemDictionary.cpp after JDK-8365526

Changes: https://git.openjdk.org/jdk/pull/28946/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28946&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374178
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28946.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28946/head:pull/28946

PR: https://git.openjdk.org/jdk/pull/28946