[boost] [serialization] portable binary archives invert no_header sense

From: Kim Barrett (kab_at_[hidden])
Date: 2006-05-20 14:59:48

The example portable binary archives (both directions) contain the following
lines in their constructor bodies:

     if(0 != (flags & boost::archive::no_header)){
         this->archive_base_t::init(flags);
         // ... more stuff
     }

The test on flags value should be "==" rather than "!=", i.e.

     if(0 == (flags & boost::archive::no_header)){