feat: Enable NIOFoundationCompat to compile using Swift for WebAssembly. Fix NIOCore WASI compilation issue.

[scottmarchant]

Fix Swift for WebAssembly compilation in NIOFoundationCompat.

Motivation:

NIO is a common dependency, and it is important to enable compiling NIO using Swift for WebAssembly. This PR fixes compilation for NIOFoundationCompat.

Modifications:

• Fix NIOFoundationCompat compilation

Result:

With these changes, the following build commands succeed: ✅

swift build --swift-sdk wasm32-unknown-wasip1-threads --target NIOCore
swift build --swift-sdk wasm32-unknown-wasip1-threads --target NIOFoundationCompat

Context:

This PR is part of a larger effort by PassiveLogic to improve Swift for WebAssembly support

[scottmarchant]

@MaxDesiatov @kateinoigakukun in case you're interested, I'm fixing Swift for WebAssembly compilation for NIOCore and NIOFoundationCompat in this PR.

[Lukasa]

Nice one, thanks!

[Lukasa]

This needs to be updated to the latest main. It may be helpful to get maintainers write access to your PR branches, as that allows me to make catch-up merges to main when a prior PR is merged.

[scottmarchant]

This needs to be updated to the latest main. It may be helpful to get maintainers write access to your PR branches, as that allows me to make catch-up merges to main when a prior PR is merged.

@Lukasa Ok, this should be rebased on the tip of main now. I'll work on getting you write access to the PR source branches.

[Lukasa]

This PR has also fallen out of step with our main branch again, I'm afraid.

[scottmarchant]

This PR has also fallen out of step with our main branch again, I'm afraid.

@Lukasa This is now rebased on the latest main.

I couldn't figure out the trick to give you write access to the branch short of adding you to our fork. I see evidence in web search results that there is a configuration to allow maintainers of the upstream fork to be able to push to PR source branches, but I can't seem to find the place to set up that configuration. If you know where I can configure that, can you send me a hint please? Happy to get that set up so you can rebase/merge as needed, and I am now prepared with admin credentials on our swift-nio fork to configure whatever is needed.