[v3] Finish overhauling stl_algobase.h

[Paolo Carlini]

Hi,

the below finishes the work on this file. I haven't tried for now to
also fix the "hack" that we have been using for _Is_normal_iterator
(i.e., forward declaration of __normal_iterator)

Took the occasion to remove a redundant #include.

Tested x86-linux (gnu/generic locale models).

Paolo.

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