fix r56467

* test/ruby/test_dir.rb (test_glob_gc_for_fd): needs
  RLIMIT_NOFILE.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56468 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_dir.rb

@@ -367,5 +367,5 @@ class TestDir < Test::Unit::TestCase
       assert_not_empty(list)
       assert_equal([*"a".."z"], list)
     end;
-  end
+  end if defined?(Process::RLIMIT_NOFILE)
 end