Fix some warnings for clang / 64bit windows
Fix some warnings for clang / 64bit windows

kamilzubair/ChaiScript,bradparks/ChaiScript__cplusplus_scripting_language,kamilzubair/ChaiScript,kamilzubair/ChaiScript,bradparks/ChaiScript__cplusplus_scripting_language,bradparks/ChaiScript__cplusplus_scripting_language