RFR: 6898: Installing from IDE update site complains about missing LZ4 plug-in

[Marcus Hirt]

This is due to the LZ4 plug-in not included in the appropriate features.

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Commit messages:
 - 6898: Installing from IDE update site complains about missing LZ4 plug-in

Changes: https://git.openjdk.java.net/jmc/pull/107/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=107&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6898
  Stats: 14 lines in 2 files changed: 14 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc/pull/107.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/107/head:pull/107

PR: https://git.openjdk.java.net/jmc/pull/107