fix build (-Werror + -Wignored-qualifiers)

libmariadb @ 5fa9c461

-Subproject commit ed3a91c139175746c5d6903d67ca902d91228f65
+Subproject commit 5fa9c4615e71b696b84b4c77aefa197466526a13

storage/innobase/include/span.h

@@ -127,8 +127,6 @@ template <class ElementType> class span {
 
 	iterator begin() const { return data_; }
 	iterator end() const { return data_ + size_; }
-	const_iterator cbegin() const { return data_; }
-	const_iterator cend() const { return data_ + size_; }
 	reverse_iterator rbegin() const
 	{
 		return std::reverse_iterator<iterator>(std::advance(end(), -1));
@@ -138,16 +136,6 @@ template <class ElementType> class span {
 		return std::reverse_iterator<iterator>(
 		    std::advance(begin(), -1));
 	}
-	const_reverse_iterator crbegin() const
-	{
-		return std::reverse_iterator<const_iterator>(
-		    std::advance(end(), -1));
-	}
-	const_reverse_iterator crend() const
-	{
-		return std::reverse_iterator<const_iterator>(
-		    std::advance(begin(), -1));
-	}
 
 private:
 	pointer data_;