This reverts commit eab88d20eaa925d5e61a2a65820a099b46ccf3f8.

  The some CI was broken with this.

`FileUtils#install` methed raises an unexpected `TypeError`, when
called with `mode:` option which has `"X"`.

```
$ ruby -rfileutils -e 'FileUtils.install("tmp/a", "tmp/b", mode: "o+X")'
/opt/local/lib/ruby/2.7.0/fileutils.rb:942:in `directory?': no implicit conversion of File::Stat into String (TypeError)
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:942:in `block (3 levels) in symbolic_modes_to_i'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:933:in `each_char'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:933:in `each'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:933:in `inject'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:933:in `block (2 levels) in symbolic_modes_to_i'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:931:in `each'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:931:in `each_slice'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:931:in `block in symbolic_modes_to_i'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:926:in `each'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:926:in `inject'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:926:in `symbolic_modes_to_i'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:973:in `fu_mode'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:883:in `block in install'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:1588:in `block in fu_each_src_dest'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:1604:in `fu_each_src_dest0'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:1586:in `fu_each_src_dest'
	from /opt/local/lib/ruby/2.7.0/fileutils.rb:877:in `install'
	from -e:1:in `<main>'
```

In spite of that `symbolic_modes_to_i` considers the `File::Stat`
`path` case at the beginning, in `"X"` case, `path` is passed to
`FileTest.directory?` method which requires a `String`.  In such
case, the mode in `path` should be examined instead.

https://github.com/ruby/fileutils/commit/2ea54ade2f

https://github.com/ruby/fileutils/commit/bb10efe104

https://github.com/ruby/fileutils/commit/ba2c24e2d7

Previously this would give an error such as:

TestFileUtils#test_cp_r_dev [c:/fileutils/test/fileutils/test_fileutils.rb:455]:
[RuntimeError] exception expected, not.
Class: <TypeError>
Message: <"no implicit conversion of nil into String">

https://github.com/ruby/fileutils/commit/0ce0fefbeb

If FileUtils is included into another object, and verbose mode is
used, a FrozenError is currently raised unless the object has the
@fileutils_output and @fileutils_label instance variables.

This fixes things so that it does not attempt to set the instance
variables, but it still uses them if they are present.

https://github.com/ruby/fileutils/commit/689cb9c56a

https://github.com/ruby/fileutils/commit/20bb9ec789

Previously, this was broken.  Trying to copy a FIFO would raise a
NoMethodError if File.mkfifo was defined.  Trying to copy a UNIX
socket would raise a RuntimeError as File.mknod is not something
Ruby defines.

Handle the FIFO issue using File.mkfifo instead of mkfifo.

Handle the UNIX Socket issue by creating a unix socket.

Continue to not support character or block devices, raising a
RuntimeError for both.

Add tests for FIFO, UNIX Socket, and character/block devices.

https://github.com/ruby/fileutils/commit/123903532d

Closes: https://github.com/ruby/ruby/pull/1425

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