RFR: 7903271: Add sample of libzstd [v3]

[Mike Duigou]

On Tue, 30 Aug 2022 13:49:24 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

samples/libzstd/README line 1:

> 1: * Install libffmpeg on Mac using homebrew

This refers to libffmpeg rather than zstd.

samples/libzstd/README line 1:

> 1: * Install libffmpeg on Mac using homebrew

You could also suggest installing with system package manager (yum, apt, …)

samples/libzstd/compile.sh line 2:

> 1: jextract -t libzstd \
> 2:   -I /usr/local/Cellar/zstd/1.5.2/include \

Consider replacing the path `/usr/local/Cellar/zstd/1.5.2` with `$(brew --prefix zstd)` or `$(pkg-config --variable=prefix libzstd)`

samples/libzstd/compile.sh line 5:

> 3:   -l zstd \
> 4:   --header-class-name Libzstd \
> 5:     /usr/local/Cellar/zstd/1.5.2/include/zstd.h

Same comment about using non-static prefix path.

samples/libzstd/compilesource.sh line 2:

> 1: jextract --source -t libzstd \
> 2:   -I /usr/local/Cellar/zstd/1.5.2/include \

Same comments for zstd prefix path.

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