genmsg: 0.5.5-0 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `genmsg` to `0.5.5-0`:

- upstream repository: git@github.com:ros/genmsg.git
- release repository: https://github.com/ros-gbp/genmsg-release.git
- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.11`
- previous version for package: `0.5.4-0`

## genmsg

```
* fix CMake syntax (#52 <https://github.com/ros/genmsg/issues/52>) (regression of 0.5.4)
```