Add directives to build github.com/thanos-io/thanos/cmd/thanos (#2086)
Adding these directives (and replace statements) allows to build the
thanos application. Thanos and some of the dependencies already depend
on gogo proto and have code checked in.
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**What type of PR is this?**
> Uncomment one line below and remove others.
>
> Bug fix
> Feature
> Documentation
> Other
**What package or component does this PR mostly affect?**
> For example:
>
> language/go
> cmd/gazelle
> go_repository
> all
**What does this PR do? Why is it needed?**
**Which issues(s) does this PR fix?**
Fixes #
**Other notes for review**
1 file changed
