rospack: 2.2.4-0 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `rospack` to `2.2.4-0`:

- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.10`
- previous version for package: `2.2.3-1`

## rospack

```
* fix find_package(PythonLibs ...) with CMake 3 (#42 <https://github.com/ros/rospack/issues/42>)
```