RFR: 7903704: Expose addresses of native functions

[Maurizio Cimadamore]

On Tue, 2 Apr 2024 15:08:48 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> Add accessors for the address of a native function. This follows the jextract principle of exposing all the information that it has.
> 
> The address is useful in cases where a user needs to pass the address of a native function to be used as a callback by another (higher-order) native function.
> 
> Note: while working on this I noticed that the `TestUtils` file was not being rebuilt when dependent tests were running. Many tests depend on this file to compile generated source code for instance. I've added the needed `@build` tags, and `lib.build` property (the latter only works for the tests under `TestNG.dirs`).

Very nice!

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Marked as reviewed by mcimadamore (Reviewer).

PR Review: https://git.openjdk.org/jextract/pull/228#pullrequestreview-1982394979