io.c: textmode if newline decorator
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59336 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
io.c: textmode if newline decorator
now. [ruby-core:80270] [Bug #13350]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59336 b2dd03c8-39d4-4d8f-98ff-823fe69b080e