Add glog v0.6.0 version

* I'm interested in package `glog` with version 0.6.0

https://github.com/google/glog/releases/tag/v0.6.0

need to disable optional dependencies searched for in upstream, we want to stay reproducible

- `WITH_UNWIND=OFF`, flag introduced with 0.5.0
- `WITH_GTEST=OFF`, flag introduced with 0.6.0