RFR: Cleaner GHA build of hermetic-java-runtime branch

[Severin Gehwolf]

Please review this simple PR which fixes build issues seen on GHA. Before this PR we see build failures in various Linux cross-builds and windows builds. This PR should fix those. Note: There are still GHA test failures, but at least we can build the branch on the main 3 platforms.

Thoughts?

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Commit messages:
 - Cleaner GHA build of hermetic-java-runtime branch

Changes: https://git.openjdk.org/leyden/pull/63/files
  Webrev: https://webrevs.openjdk.org/?repo=leyden&pr=63&range=00
  Stats: 17 lines in 4 files changed: 7 ins; 4 del; 6 mod
  Patch: https://git.openjdk.org/leyden/pull/63.diff
  Fetch: git fetch https://git.openjdk.org/leyden.git pull/63/head:pull/63

PR: https://git.openjdk.org/leyden/pull/63