RFR: 7940: Fix manifest making the Eclipse IDE unhappy

[Marcus Hirt]

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Commit messages:
 - 7940: Fix manifest making the Eclipse IDE unhappy

Changes: https://git.openjdk.org/jmc/pull/445/files
 Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=445&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-7940
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jmc/pull/445.diff
  Fetch: git fetch https://git.openjdk.org/jmc pull/445/head:pull/445

PR: https://git.openjdk.org/jmc/pull/445