Fix creating util::span<T const> from an array of non-const T

libs/util/include/psemek/util/span.hpp

@@ -46,6 +46,13 @@ namespace psemek::util
 			, p_end{a + N}
 		{}
 
+		template <std::size_t N>
+		requires (!std::is_same_v<T, std::remove_cv_t<T>>)
+		span(std::remove_cv_t<T> (&a)[N])
+			: p_begin{a}
+			, p_end{a + N}
+		{}
+
 		template <typename Container>
 		span(Container && a)
 			: p_begin{a.data()}