[boost] serialization lib minor suggestion (to Robert Ramey)

Hello, Robert! I've got a couple of linker error with std::wostream & operator<<(std::wostream &os, const char t) and std::wostream & operator<<(std::wostream &os, const char *t) when defining custom archives and explicitly instantiating them in separate library. Can you declare these operators as inline - its would be more convenient for anyone performing same task? With best regards, Sergey.