RFR: 8293964: Unused check_for_duplicates parameter in ClassLoaderExt::process_jar_manifest

[Matias Saavedra Silva]

The check_for_duplicates parameter in ClassLoaderExt::process_jar_manifest was removed due to it being unused. Ran tier1 to verify. Please review

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Commit messages:
 - 8293964: Unused check_for_duplicates parameter in ClassLoaderExt::process_jar_manifest

Changes: https://git.openjdk.org/jdk/pull/10425/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10425&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293964
  Stats: 4 lines in 3 files changed: 0 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/10425.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10425/head:pull/10425

PR: https://git.openjdk.org/jdk/pull/10425