github ghc.git broken on libraries/binary

[Shayne Fletcher]

`git clone git at github.com:ghc/ghc.git` followed by `git submodule update
--init --recursive` results in
```

error: Server does not allow request for unadvertised object
94855814e2e4f7a0f191ffa5b4c98ee0147e3174

Fetched in submodule path 'libraries/binary', but it did not contain
94855814e2e4f7a0f191ffa5b4c98ee0147e3174. Direct fetching of that commit
failed.
```
-- 
Shayne Fletcher
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