Asio bad_address_cast fix under no exceptions

[kvankooten]

When using the Asio module in MSVC when exceptions are disabled, deriving an exception from bad_cast throws a linker error. A simple fix would look similar to the lexical_cast, bad_any_cast, etc.

[kvankooten@…]

The class bad_adress_cast in bad_address_cast.hpp can be derived as follows:

class bad_address_cast :
#if defined(BOOST_MSVC) && defined(_HAS_EXCEPTIONS) && !_HAS_EXCEPTIONS 
        public std::exception 
#else 
        public std::bad_cast 
#endif
{
...
}