Debug iterators operator->

[François Dumont]

Hi

    I always wanted to fix those operators implementation so that it
just use underlying iterator -> operator like for the other operators.
And I also notice the @todo on it today so maybe it is still time to fix
those.

    * include/debug/safe_iterator.h
    (_Safe_iterator<>::operator->()): Implement using underlying iterator
    same operator.
    * include/debug/safe_local_iterator.h
    (_Safe_local_iterator<>::operator->()): Likewise.


Tested under Linux x86_64 debug mode of course.

François

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