RFR: 7526: JMC not buildable with jdk17 [v16]

[Johannes Bechberger]

> Tested on Java 11 x86 and aarch64 (azul, but only builds), and on Java 17 x86 and aarch64.

Johannes Bechberger has updated the pull request incrementally with one additional commit since the last revision:

  Readd workaround

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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/363/files
  - new: https://git.openjdk.java.net/jmc/pull/363/files/dc5af324..2dd7b5e0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=363&range=15
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=363&range=14-15

  Stats: 2 lines in 2 files changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc/pull/363.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/363/head:pull/363

PR: https://git.openjdk.java.net/jmc/pull/363