RFR: fixing jextract sample issues for jdk 22 [v4]

[Maurizio Cimadamore]

On Fri, 12 Jan 2024 13:37:23 GMT, Athijegannathan Sundararajan <sundar at openjdk.org> wrote:

>> * re-generated libjimage sources and manually adopted for library loding.
>> * avoid attempting to generate unsupported type constants ("long double")
>> * adjust shell scripts for different versions of native libraries
>> * allow Python home to be overridden by env. vars
>
> Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   avoiding long double. using __int128 instead (Windows)

Marked as reviewed by mcimadamore (Reviewer).

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PR Review: https://git.openjdk.org/jextract/pull/174#pullrequestreview-1818293589