[ruby-core:98563] [Ruby master Bug#16918] Dir.mktmpdir should yield a copy of the dir to protect cleanup

Issue #16918 has been reported by headius (Charles Nutter).

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Bug #16918: Dir.mktmpdir should yield a copy of the dir to protect cleanup
https://bugs.ruby-lang.org/issues/16918

* Author: headius (Charles Nutter)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-darwin18]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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If you modify the dir string passed into the block from `Dir.mktmpdir`, the logic to clean up the temporary directory may fail:

```
$ rvm ruby-2.6.5 do ruby -rtmpdir -e "Dir.mktmpdir('foo') {|dir| dir << 'bar'}"
Traceback (most recent call last):
	9: from -e:1:in `<main>'
	8: from /Users/headius/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/tmpdir.rb:101:in `mktmpdir'
	7: from /Users/headius/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/fileutils.rb:758:in `remove_entry'
	6: from /Users/headius/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/fileutils.rb:1480:in `postorder_traverse'
	5: from /Users/headius/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/fileutils.rb:760:in `block in remove_entry'
	4: from /Users/headius/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/fileutils.rb:1425:in `remove'
	3: from /Users/headius/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/fileutils.rb:1436:in `remove_file'
	2: from /Users/headius/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/fileutils.rb:1442:in `platform_support'
	1: from /Users/headius/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/fileutils.rb:1437:in `block in remove_file'
/Users/headius/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/fileutils.rb:1437:in `unlink': No such file or directory @ apply2files - /var/folders/cq/ylcgmnn556x33f5hsqd0h54h0000gn/T/foo20200528-99594-tuq6pubar (Errno::ENOENT)
```

I believe `Dir.mktmpdir` should protect its cleanup logic by yielding a copy of the dir string, rather than the exact string object it intends to use for cleanup.



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