[jfx11u] RFR: 8257758: Allow building of JavaFX native libs for Apple Silicon

[Johan Vos]

Reviewed-by: kcr

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Commit messages:
 - 8257758: Allow building of JavaFX native libs for Apple Silicon

Changes: https://git.openjdk.java.net/jfx11u/pull/19/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=19&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257758
  Stats: 10 lines in 1 file changed: 9 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx11u/pull/19.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx11u pull/19/head:pull/19

PR: https://git.openjdk.java.net/jfx11u/pull/19