[WIP PATCH 0/2 rust/rust-libc] GNU/Hurd support

[Damien Zammit]

Hi,

I had another go at porting rust to hurd this weekend.
This is based on my previous attempt from 2021.
It needs to be rebased onto latest rust, and missing bits fixed.
I got closer to cross-compiling the stage1 i686-unknown-hurd-gnu target but
failed on libstd with 219 compilation errors.

VedantT, feel free to take this work and continue working on it.

This works best when you clone rust and rust-libc into the same parent folder,
as I have tweaked the paths to be relative to this layout.

Good luck!

Damien