Fix log behavior for templated output operators

libs/log/include/psemek/log/log.hpp

@@ -30,7 +30,7 @@ namespace psemek::log
 		template <typename T>
 		log_stream & operator << (T const & x)
 		{
-			os_ << x;
+			static_cast<std::ostream &>(os_) << x;
 			return *this;
 		}