[jdk21u-dev] RFR: 8357675: Amend headless message

[Goetz Lindenmaier]

I backport this for parity with 21.0.9-oracle,

Resolved Copyright, probably clean.

-------------

Commit messages:
 - backport 12ee80cac754c1a6dd37191a9f80c01de8b659ad

Changes: https://git.openjdk.org/jdk21u-dev/pull/2001/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2001&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357675
  Stats: 3 lines in 1 file changed: 0 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2001.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2001/head:pull/2001

PR: https://git.openjdk.org/jdk21u-dev/pull/2001