wasix support about hostname

[svartalf]

@hitchhooker this looks like the opposite of what we are looking for, as it resolves a DNS hostname into IP addresses (similar to getaddrinfo(3), for example).

In addition, I'm not sure how to determine during the compile time that we are compiling for Wasix specifically, as there is no such compilation target in Rust.

With all of it, it seems like there is nothing can be done to resolve this issue for now.

[svartalf]

Same to #16 and the discussion at #15 , there is nothing that can be done for this crate unless Wasix introduces some way to get the machine hostname.

Let's keep this issue open and use it as a tracking issue.

[hitchhooker]

https://wasix.org/docs/api-reference/wasix/resolve
would this do?