Integrated: Refresh libclang

[Maurizio Cimadamore]

On Tue, 19 Dec 2023 11:34:40 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> Following the latest jextract changes, it is now time to refresh the libclang classes used by jextract. As a result, this change will drop `RuntimeHelper` and all constant classes (as the new generation strategy no longer needs them).
> 
> I encountered a couple of issues when running the updating script, which prompted me to simplify the script, and to add some more documentation.

This pull request has now been integrated.

Changeset: d112a676
Author:    Maurizio Cimadamore <mcimadamore at openjdk.org>
URL:       https://git.openjdk.org/jextract/commit/d112a676b9b14ca1aa67f54f0bf2857805405be1
Stats:     7505 lines in 36 files changed: 3229 ins; 2808 del; 1468 mod

Refresh libclang

Reviewed-by: jvernee

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PR: https://git.openjdk.org/jextract/pull/168