RFR: 8280840: Update libFFI to 3.4.2

[Alexander Matveev]

On Sat, 19 Feb 2022 07:45:43 GMT, Alexander Matveev <almatvee at openjdk.org> wrote:

> LibFFI updated to 3.4.2. No additional changes to our code, libffi code or build system were required. Tested on all platforms.

[v2] - Fixed TAB issue.
[v3] - Fixed space alignment issue in aarch64/ffitarget.h.

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PR: https://git.openjdk.java.net/jfx/pull/738