Auto merge of #1227 - retep998:master, r=huonw

Fixes the following issue while building Cargo
```
   Compiling cargo v0.1.0 (file:///C:/msys64/home/Peter/cargo)
src\cargo\lib.rs:7:1: 7:20 error: can't find crate for `regex`
src\cargo\lib.rs:7 extern crate regex;
                   ^~~~~~~~~~~~~~~~~~~
error: aborting due to previous error
Could not compile `cargo`.
```