Compiling s2n-quic-platform on musl

[yixinin]

ENV:

Host:
Linux 8cbeb297efdc 5.10.0-23-amd64 #1 SMP Debian 5.10.179-1 (2023-05-12) x86_64 Linux

rustup host:
x86_64-unknown-linux-musl (in docker rust:alpine)
target:
x86_64-unknown-linux-musl

Problem:

error[E0308]: mismatched types
--> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/s2n-quic-platform-0.31.0/src/syscall/mmsg.rs:140:52
|
140 | let res = libc!(recvmmsg(sockfd, msgvec, vlen, flags, timeout));
| ^^^^^ expected u32, found i32
note: function defined here
--> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/libc-0.2.150/src/unix/linux_like/linux/musl/mod.rs:723:12
|
723 | pub fn recvmmsg(
| ^^^^^^^^
help: you can convert an i32 to a u32 and panic if the converted value doesn't fit
|
140 | let res = libc!(recvmmsg(sockfd, msgvec, vlen, flags.try_into().unwrap(), timeout));
| ++++++++++++++++++++

[camshaft]

I tried compiling the entire workspace for musl and it looks like there's a few other issues with aws-lc-rs and s2n-tls that need to be addressed before we can add a CI task to prevent future regressions.

This PR should fix the s2n-tls issue: aws/s2n-tls#4295

Still investigating the aws-lc-rs issue: https://gist.github.com/camshaft/95441e79397186398d4455e8e820a7a9

[camshaft]

The aws-lc-rs issue should be fixed by aws/aws-lc-rs#283

[camshaft]

Fixed in #2102