for toolchains without cargo, set up environment to match rustc, not cargo
for toolchains without cargo, set up environment to match rustc, not cargo

inejge/rustup.rs,nodakai/rustup.rs,nodakai/rustup.rs,rust-lang/rustup,nodakai/rustup.rs,rust-lang/rustup,rust-lang/rustup,rust-lang/rustup,inejge/rustup.rs,nodakai/rustup.rs,inejge/rustup.rs,inejge/rustup.rs,inejge/rustup.rs,rust-lang/rustup,nodakai/rustup.rs