[boost] [shared_ptr] possible bug in sp_counted_base_cw_ppc.hpp

I think that the functions atomic_increment atomic_decrement atomic_conditional_increment should be marked as inline, as they are defined in a header file. This is causing multiple definition problems, see for instance http://tinyurl.com/6eub2 Joaquín M López Muñoz Telefónica, Investigación y Desarrollo