Override always 'CARGO_HOME' env variable.
This use always `cargo-home-dir` in `/.servobuild` even if you set `CARGO_HOME` in your shell. If you use [racer][racer] with [rustup (multirust.rs)][rustup], you may set `CARGO_HOME` env variable. Then the previous code would be a problem which does not use `cargo-home-dir` in `/.servobuild`. [racer]: https://github.com/phildawes/racer [rustup]: https://github.com/rust-lang-nursery/rustup.rs
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