fix r45274; it change default but doesn't change tests [Bug #9424]

RUN TESTS BEFORE COMMIT!!!

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45278 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-03-07

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45279 b2dd03c8-39d4-4d8f-98ff-823fe69b080e