maybe after bundler introduction to this repository, we randomly hit
errors like:
http://ci.rvm.jp/results/trunk-gc-asserts@silicon-docker/1447918
As we would require minitest in this repository anyway, it should be
fine to suppress the error there.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65613 b2dd03c8-39d4-4d8f-98ff-823fe69b080e