bors d956975e7d auto merge of #12899 : brson/rust/cleanbacktrace, r=alexcrichton
After `make clean` I'm seeing the build break with

```
cp: cannot stat ‘x86_64-unknown-linux-gnu/rt/libbacktrace/.libs/libbacktrace.a’: No such file or directory
```

Deleteing the libbacktrace dir entirely on clean fixes.
2014-03-16 01:36:21 -07:00
..
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