Guard out the test when it is run under root permission

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67247 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/fileutils/test_fileutils.rb

@@ -741,12 +741,14 @@ class TestFileUtils < Test::Unit::TestCase
     assert_file_not_exist 'tmp/tmpdir/a'
     assert_file_not_exist 'tmp/tmpdir/c'
 
-    File.chmod(01777, 'tmp/tmpdir')
-    if File.sticky?('tmp/tmpdir')
-      Dir.mkdir 'tmp/tmpdir/d', 0
-      assert_raise(Errno::EACCES) {remove_entry_secure 'tmp/tmpdir/d'}
-      File.chmod 0777, 'tmp/tmpdir/d'
-      Dir.rmdir 'tmp/tmpdir/d'
+    unless root_in_posix?
+      File.chmod(01777, 'tmp/tmpdir')
+      if File.sticky?('tmp/tmpdir')
+        Dir.mkdir 'tmp/tmpdir/d', 0
+        assert_raise(Errno::EACCES) {remove_entry_secure 'tmp/tmpdir/d'}
+        File.chmod 0777, 'tmp/tmpdir/d'
+        Dir.rmdir 'tmp/tmpdir/d'
+      end
     end
 
     Dir.rmdir 'tmp/tmpdir'