patch 8.2.3572: memory leak when closing window and using "multispace"

Problem:    Memory leak when closing window and using "multispace" in
            'listchars'.
Solution:   Free the memory. (closes #9071)

src/version.c

@@ -757,6 +757,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3572,
 /**/
     3571,
 /**/