[jfx21u] RFR: 8317370: JavaFX runtime version is wrong at runtime

[John Neffenger]

Backport 16169240667876633895b27464eb90033abb6166

Please review this backport of openjdk/jfx#1253 to JavaFX 21. Please give me a day or two to test it again before starting your review.

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Commit messages:
 - Backport 16169240667876633895b27464eb90033abb6166

Changes: https://git.openjdk.org/jfx21u/pull/32/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx21u&pr=32&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317370
  Stats: 117 lines in 4 files changed: 66 ins; 39 del; 12 mod
  Patch: https://git.openjdk.org/jfx21u/pull/32.diff
  Fetch: git fetch https://git.openjdk.org/jfx21u.git pull/32/head:pull/32

PR: https://git.openjdk.org/jfx21u/pull/32