Bug#831724: Pending fixes for bugs in the mtail package

[pkg-go-maintainers]

tag 831724 + pending
thanks

Some bugs in the mtail package are closed in revision
b84342f62776faa11683b53b5d7380697bd74056 in branch 'debian/sid' by
Martín Ferrari

The full diff can be seen at
https://anonscm.debian.org/cgit/pkg-go/packages/mtail.git/commit/?id=b84342f

Commit message:

    Don't run race tests on any arch except amd64. Closes: #831724.