[jfx11u] RFR: 8257895: Allow building of JavaFX media libs for Apple Silicon

[Johan Vos]

Co-authored-by: Johan Vos <jvos at openjdk.org>
Reviewed-by: jvos, kcr

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Commit messages:
 - 8257895: Allow building of JavaFX media libs for Apple Silicon

Changes: https://git.openjdk.java.net/jfx11u/pull/20/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=20&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257895
  Stats: 3577 lines in 19 files changed: 3553 ins; 5 del; 19 mod
  Patch: https://git.openjdk.java.net/jfx11u/pull/20.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx11u pull/20/head:pull/20

PR: https://git.openjdk.java.net/jfx11u/pull/20