Link stage0-sysroot in `link_rust.sh`

[jyn514]

This is supported since rust-lang/rust#101691.

Relevant code:

simpleinfra/ansible/roles/dev-desktop/files/scripts/link_rust.sh

Line 28 in 75573f9

stages=(stage1 stage2)

Originally posted by @jyn514 in rust-lang/rustc-dev-guide#1615 (review)