fix condition to set yaml engine
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35450 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
fix condition to set yaml engine
fix condition to set yaml engine.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35450 b2dd03c8-39d4-4d8f-98ff-823fe69b080e