skip failed gems
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55952 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
skip failed gems
[ruby-dev:49764] [Bug #12683]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55952 b2dd03c8-39d4-4d8f-98ff-823fe69b080e