Clean backport to `jfx11u`. Tested in connection with gstreamer / glib update in the `test-kcr-11.0.16` branch.
------------- Commit messages: - 8280840: Update libFFI to 3.4.2 Changes: https://git.openjdk.java.net/jfx11u/pull/93/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=93&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8280840 Stats: 3475 lines in 34 files changed: 927 ins; 38 del; 2510 mod Patch: https://git.openjdk.java.net/jfx11u/pull/93.diff Fetch: git fetch https://git.openjdk.java.net/jfx11u pull/93/head:pull/93 PR: https://git.openjdk.java.net/jfx11u/pull/93
