[jdk21u] RFR: 8376684: Compile OpenJDK in headless mode without required X11 libraries

[Thomas Devoogdt]

Backport-of: 1069ccebcc32e02055985e2babfa2986a2e295ca

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Commit messages:
 - 8376684: Compile OpenJDK in headless mode without required X11 libraries

Changes: https://git.openjdk.org/jdk21u/pull/482/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=482&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8376684
  Stats: 30 lines in 5 files changed: 14 ins; 5 del; 11 mod
  Patch: https://git.openjdk.org/jdk21u/pull/482.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/482/head:pull/482

PR: https://git.openjdk.org/jdk21u/pull/482