ADL issues: deque

[Paolo Carlini]

Hi,

simpler than I thought ;) Again, same issue which affected
__normal_iterator with the missing overload of operator- for equal
types, plus just a couple of missing casts to difference_type (usually
the implementation is very careful about that, in e.g., operator=,
_M_reserve_elements_at_*, erase(iterator, iterator), operator[], and
many other places).

Will wait until tomorrow, just in case I'm missing something, deque is
complex.

Tested x86-linux.

Paolo.

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