RFR: 7903663: update jextract sample scripts for library loading and varargs handling changes

[Maurizio Cimadamore]

On Thu, 15 Feb 2024 13:47:16 GMT, Athijegannathan Sundararajan <sundar at openjdk.org> wrote:

> * all samples updated to use -l <name> or -l :<path> options. 
> * No -Djava.library.path settings in run.sh.
> * libjimage avoid pre-extracted checked-in sources.

Looks good - I like that we use little env vars to point at the library home dir

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Marked as reviewed by mcimadamore (Reviewer).

PR Review: https://git.openjdk.org/jextract/pull/210#pullrequestreview-1882905469