RFR: 8345040: Clean up unused variables and code in `generate_native_wrapper`

[duke]

On Tue, 26 Nov 2024 08:16:56 GMT, Qizheng Xing <qxing at openjdk.org> wrote:

> Some of variables and code are related to critical JNI natives feature, which was removed in JDK 18. This patch cleans them up.

@MaxXSoft 
Your change (at version 9a516b1b665dd21d93b0abd45ac30fa8d1d0e11e) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/22384#issuecomment-2529966980