[ruby/tempfile] Fix Tempfile#{dup,clone}

Instead of storing the delegate in @tmpfile, use __getobj__, since
delegate library already handles dup/clone for that.  Copy the
unlinked, mode, and opts instance variables to the returned object
when using dup/clone.

Split the close/unlink finalizer into two finalizers. The close
finalizer always closes when any Tempfile instance is GCed, since
each Tempfile instance uses a separate file descriptor. The unlink
finalizer unlinks only when the original and all duped/cloned
Tempfiles are GCed, since all share the same path.

For Tempfile#open, undefine the close finalizer after closing the
current file, the redefine the close finalizer with the new file.

Fixes [Bug #19441]

https://github.com/ruby/tempfile/commit/dafabf9c7b

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