RFR: 8336938: Update libFFI to 3.4.6 [v2]

[Kevin Rushforth]

On Tue, 13 Aug 2024 19:04:09 GMT, Alexander Matveev <almatvee at openjdk.org> wrote:

>> - 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]

Code changes look good. Testing looks good.

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Marked as reviewed by kcr (Lead).

PR Review: https://git.openjdk.org/jfx/pull/1531#pullrequestreview-2236361557