remove temporally files explicitly.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24908 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_argf.rb

@@ -28,11 +28,12 @@ class TestArgf < Test::Unit::TestCase
     @tmps.each {|t|
       bak = t.path + ".bak"
       File.unlink bak if File.file? bak
+      t.close(true)
     }
   end
 
   def make_tempfile
-    t = Tempfile.new("argf-foo")
+    t = Tempfile.new("argf-qux")
     t.puts "foo"
     t.puts "bar"
     t.puts "baz"