SDL2 broken on macOS at link time

[mosteo]

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[github-actions]

This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[simonjwright]

As far as I know, the problem here is that the library (e.g. sdl.ads, but others too, no doubt) has Ada 2022 constructs, so that a client crate has to use -gnat2022 or equivalent. Are there other library crates which impose this on users?

[mosteo]

Are there other library crates which impose this on users?

One recent example that I found is vss. And uxstrings I think too.

If this is all there is to it, we need to add a proper test action for such crates.

I wonder if the minimum Ada version should become part of the manifest.