RFR: 7903271: Add sample of libzstd [v3]

Tue Aug 30 13:49:24 UTC 2022

On Tue, 30 Aug 2022 13:46:05 GMT, Per Minborg <duke at openjdk.org> wrote:

>> This PR adds a sample using `libzstd`, a high-performance compression library.
>
> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update copyright year

This is cool! LGTM

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Marked as reviewed by sundar (Committer).

PR: https://git.openjdk.org/jextract/pull/66