RFR: 8336938: Update libFFI to 3.4.6 [v2]

[Alexander Matveev]

> - libFFI updated to 3.4.6.
> - No additional changes are done.
> - Tested on Windows, macOS and Linux with all supported formats.

Alexander Matveev has updated the pull request incrementally with one additional commit since the last revision:

  8336938: Update libFFI to 3.4.6 [v2]

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/1531/files
  - new: https://git.openjdk.org/jfx/pull/1531/files/e51e5c71..c4a9d5b2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1531&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1531&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/1531.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1531/head:pull/1531

PR: https://git.openjdk.org/jfx/pull/1531