[v3] Fix std::iter_swap vs vector<bool> in C++11 mode

[Paolo Carlini]

Hi,

these are the simple (should be safe for 4.7.1 too) changes for the 
issue recently raised by Daniel on the library reflector (32207). The 
swap overloads for std::bitset are more tricky because its iterator 
isn't S.C.A.R.Y. but in any case that is definitely beyond the letter of 
C++11, can wait for 4.8.

Tested x86_64-linux.

Thanks,
Paolo.

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