tee_input: avoid instance variables, it's a struct

We'll use struct members exclusively from now on instead of
throwing ivars into the mix.  This allows us to _unofficially_
support direct access to more members easily.  Unofficial
extensions may include the ability to splice(2)/tee(2) for
better performance.

This also makes our object size smaller across all Ruby
implementations as well, too (helps Rainbows! out).

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