RFR: 8311: Ensure ./build.sh --installCore respects --skipJDPMulticastTests

[Martin Skarsaune]

8311: Ensure ./build.sh --installCore respects --skipJDPMulticastTests

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Commit messages:
 - JMC-7539: Ensure installCore respects avoiding JDP tests

Changes: https://git.openjdk.org/jmc/pull/619/files
  Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=619&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-8311
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jmc/pull/619.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/619/head:pull/619

PR: https://git.openjdk.org/jmc/pull/619