Update to new THROW macro.

src/Library/Exceptions/CreatureException.hpp

@@ -7,6 +7,6 @@
     } catch (const ArbUt::Exception& e) {                                                                              \
         throw e;                                                                                                       \
     } catch (const std::exception& e) {                                                                                \
-        THROW(msg << ": '" << e.what() << "'.");                                                                       \
+        THROW(msg, ": '", e.what(), "'.");                                                                             \
     }
 #endif // CREATURELIB_CREATUREEXCEPTION_HPP