[Patch] Start using the front-end traits in the library

[Paolo Carlini]

Hi,

these are the first bits (besided those parts of the big C++ patch), 
using the traits for the implementation of the C++03 library. Actually, 
only __is_pod and __has_trivial_destructor are exploited, among the most 
straightforward.

Tested x86/x86-64-linux.

Paolo.

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