Rust: Update legacy MaD models 4

[geoffw0]

Final update of legacy MaD models to the new model format (continues from #19946 and should be independent of that).

There's a lot of guesswork involved in this last set of changes - i.e. cases where I couldn't find a real getCanonicalPath. There should be tests for most of them though so we will find out if we're way off.

[geoffw0]

I think it will be prudent to get the first two/three PRs merged before attempting to address the test failures here.

[aibaars]

The test failures look libc related. It looks like the fn free() in libc doesn't have a result for ItemNode::getCanonicalPath() .

The relevant bits of code are

• https://github.com/rust-lang/libc/blob/8e6f36c6ba5c91c150f2d79a06ffdc3d0b83a0f6/src/lib.rs#L75-L83
• https://github.com/rust-lang/libc/blob/8e6f36c6ba5c91c150f2d79a06ffdc3d0b83a0f6/src/unix/mod.rs#L682

I would expect the canonical path to be either libc::unix::free or libc::free.

This should address the underlying issue #19988

[geoffw0]

I've brought in the fix for extern blocks from main, fixed the libc models, and fixed a couple of typos in other models. There are still a few regressions, but I feel they're at a level where we can merge this and come back to them later.

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