[v3] Simplify a tad _Bind<_Functor(_Bound_args...)>

[Paolo Carlini]

Hi all, Jon,

I'm thinking of simplifying a bit the recently introduced mechanism like
this. Can you imagine anything wrong with it? Passes regtesting, of course.

As a side note, I think it would be really nice if we could use *only*
result_of instead, thus hiding declval tricks, but I don't think it's
feasible, did you try hard Jon?

Paolo.

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