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.