[jfx11u] RFR: 8278260: JavaFX shared libraries not stripped on Linux or macOS

[Kevin Rushforth]

Clean backport to `jfx11u`.

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Commit messages:
 - 8278260: JavaFX shared libraries not stripped on Linux or macOS

Changes: https://git.openjdk.java.net/jfx11u/pull/71/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=71&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278260
  Stats: 68 lines in 3 files changed: 65 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jfx11u/pull/71.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx11u pull/71/head:pull/71

PR: https://git.openjdk.java.net/jfx11u/pull/71