k0kubun 57005046a1 tool/downloader.rb: retry Net::OpenTimeout
to prevent random failure
https://travis-ci.org/ruby/ruby/jobs/461667474

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66110 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2018-12-01 00:37:54 +00:00
..
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