[boost] crc.hpp:569 msvc warning C4800

https://github.com/boostorg/crc/pull/2 Visual Studio 2010-2019 issue this warning for crc.hpp line 569: warning C4800: "'int' : forcing value to bool 'true' or 'false' (performance warning) bool const quotient = remainder & high_bit_mask; Replace with: bool const quotient = (remainder & high_bit_mask) != 0;