[jfx17u] RFR: 8304665: Change to Xcode12.4+1.1 devkit

[Johan Vos]

clean backport of 8304665: Change to Xcode12.4+1.1 devkit
Reviewed-by: jvos, arapte

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Commit messages:
 - 8304665: Change to Xcode12.4+1.1 devkit

Changes: https://git.openjdk.org/jfx17u/pull/136/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=136&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304665
  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jfx17u/pull/136.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u.git pull/136/head:pull/136

PR: https://git.openjdk.org/jfx17u/pull/136