Remove extraneous unpacking
Remove extraneous unpacking

A lot of the tests moved to cli-paths used mutexes or init commands
that performed a lot of unnecessary behavior, especially on Unix.
By defaulting to no toolchain and removing the mutex this can be
sped up quite a bit.

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