COMMIT [NARUSE, Yui] Fix 2af135c5, run specs it can run.	http://github.com/rubyspec/rubyspec/commit/fa2658b2b967e7391f1493c7674067e0452a4fb7
COMMIT [NARUSE, Yui] Add nil case.	http://github.com/rubyspec/rubyspec/commit/d4cbc89df201ff220b5a28f7ab7e9f819ac8642b
COMMIT [NARUSE, Yui] Etc.getlogin may return nil if the login name is not set because of chroot or sudo or something.	http://github.com/rubyspec/rubyspec/commit/35b547f903a26cd54784cf284fb8dbb7f7f446d7