test_file.rb: fix noatime
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56559 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_file.rb: fix noatime
[ruby-core:77943] [Bug #12903]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56559 b2dd03c8-39d4-4d8f-98ff-823fe69b080e