Alex Crichton 08741494db Rollup merge of #38388 - redox-os:config_toml_prefix, r=alexcrichton
Add prefix to config.toml

This allows `rustbuild` to be used to install to a prefix.
```toml
[build]
prefix = "/path/to/install"
```
For example, the following `config.toml` will cause `x.py dist --install` to install to `/path/to/install`
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