Fix math::clamp(x, interval) - use std::min/max as extension points

libs/math/include/psemek/math/interval.hpp

@@ -287,7 +287,9 @@ namespace psemek::math
 	template <typename T>
 	T clamp(T x, interval<T> const & i)
 	{
-		return std::max(i.min, std::min(i.max, x));
+		using std::min;
+		using std::max;
+		return max(i.min, min(i.max, x));
 	}
 
 	template <typename T>