[ruby/fileutils] Make copy methods handle FIFOs and UNIX sockets

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

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