Add limited support for WebAssembly WASI target #21344
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As part of experiments regarding compiling CURL into WebAssembly/WASI and running on WAMR (socket API is not standardized yet) I had to make a few fixes to make an HTTPS call to a server. The change probably doesn't cover all the usecases, but it's a good start I guess.
If the community in general agrees with the approach, I'll update the CI scripts so we can make sure the WASM/WASI experience doesn't degrade. For now I'm just testing the water - feedback is very welcome.
Checklist