RFR: 8324048: (fc) Make FileKey fields final

[Brian Burkhalter]

On Wed, 21 Aug 2024 17:47:42 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> I assume a System.loadLibrary (by way of IOUtil.load) is needed, otherwise dependent on something else loading the native library.

I think that is correct after all. It should load the NIO native library, which defines `fdval()` and `handleval()`. I must have confounded this with #20317 wherein those symbols are moved to `libjava`.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20429#discussion_r1725532993