* ext/-test-/dir: Dir#fileno implemented.

* test/lib/minitest/unit.rb (find_fds): Don't return the fd used to
  scan /proc/$$/fd.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46240 b2dd03c8-39d4-4d8f-98ff-823fe69b080e