io/console: compatibility with 1.9
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39268 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
io/console: compatibility with 1.9
with ruby 1.9. [ruby-core:52220] [Bug #7847]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39268 b2dd03c8-39d4-4d8f-98ff-823fe69b080e