mxcl/homebrew — pull request #10445 by bartleusink (2012-02-24 09:26:45+00:00)
Title: fix-up HEAD install

Without it, brew install go --HEAD fails with:
```go tool dist: /usr/local/Cellar/go/HEAD/src/cmd/cov should not exist in release build```

This is due to this change in upstream:
http://codereview.appspot.com/5654068

Basically, the go build script checks whether the version is a release build, in which case it doesn't expect to see cov and prof in cmd/dist