Function cargo::core::compiler::sysroot_remap

fn sysroot_remap(build_runner: &BuildRunner<'_, '_>, unit: &Unit) -> OsString

Path prefix remap rules for sysroot.

This remap logic aligns with rustc: https://github.com/rust-lang/rust/blob/c2ef3516/src/bootstrap/src/lib.rs#L1113-L1116