test_io.rb: separate platform-specific tests
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49763 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_io.rb: separate platform-specific tests
time instead of runtime.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49763 b2dd03c8-39d4-4d8f-98ff-823fe69b080e