[ruby-core:91362] [Ruby trunk Bug#15577] FileUtils.remove_entry_secure() raises unexpected NameError

Issue #15577 has been reported by Tietew (Toru Iwase).

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Bug #15577: FileUtils.remove_entry_secure() raises unexpected NameError
https://bugs.ruby-lang.org/issues/15577

* Author: Tietew (Toru Iwase)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.1p33 (2019-01-30 revision 66950) [x86_64-linux]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
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## How to reproduce

```
$ sudo mkdir /tmp/foobar
$ ruby -rfileutils -e 'FileUtils.remove_entry_secure("/tmp/foobar")'
Traceback (most recent call last):
        4: from -e:1:in `<main>'
        3: from /usr/local/anyenv/envs/rbenv/versions/2.6.1/lib/ruby/2.6.0/fileutils.rb:689:in `remove_entry_secure'
        2: from /usr/local/anyenv/envs/rbenv/versions/2.6.1/lib/ruby/2.6.0/fileutils.rb:689:in `open'
        1: from /usr/local/anyenv/envs/rbenv/versions/2.6.1/lib/ruby/2.6.0/fileutils.rb:695:in `block in remove_entry_secure'
/usr/local/anyenv/envs/rbenv/versions/2.6.1/lib/ruby/2.6.0/fileutils.rb:695:in `chown': Operation not permitted @ rb_file_chown - /tmp/foobar/. (Errno::EPERM)
        2: from -e:1:in `<main>'
        1: from /usr/local/anyenv/envs/rbenv/versions/2.6.1/lib/ruby/2.6.0/fileutils.rb:688:in `remove_entry_secure'
/usr/local/anyenv/envs/rbenv/versions/2.6.1/lib/ruby/2.6.0/fileutils.rb:698:in `rescue in remove_entry_secure': uninitialized constant FileUtils::EISDIR (NameError)
```

### Expected
Raises `Errno::EPERM`

### Actual
Raises `NameError` (uninitialized constant FileUtils::EISDIR)

## Patch

``` patch
diff --git a/lib/fileutils.rb b/lib/fileutils.rb
index dc7261857b..8981ef98e8 100644
--- a/lib/fileutils.rb
+++ b/lib/fileutils.rb
@@ -695,7 +695,7 @@ def remove_entry_secure(path, force = false)
         f.chown euid, -1
         f.chmod 0700
       }
-    rescue EISDIR # JRuby in non-native mode can't open files as dirs
+    rescue Errno::EISDIR # JRuby in non-native mode can't open files as dirs
       File.lstat(dot_file).tap {|fstat|
         unless fu_stat_identical_entry?(st, fstat)
           # symlink (TOC-to-TOU attack?)
```

## Versions
- 2.3.8: Good
- 2.4.5: Good
- 2.5.3: Good
- 2.6.1: Bad
- trunk: Bad



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