Update __phutil_library_map__ with 'arc liberate'

Summary:
Trying to fix that damn

```
DEPRECATED: ArcanistBaseUnitTestEngine is deprecated; You should extend from `ArcanistUnitTestEngine` instead.
```

Reviewers: matt, NorthIsUp, BYK

Reviewed By: BYK

Differential Revision: http://phabricator.local.disqus.net/D14669