patch 8.2.3427: double free when list is copied

Problem:    Double free when list is copied.
Solution:   Allocate the type when making a copy. (closes #8862)
            Clear the type for flattennew().  Avoid a memory leak when
            flattennew() fails.

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3427,
 /**/
     3426,
 /**/