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.
diff --git a/src/version.c b/src/version.c
index c98249b..f82881f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3427,
+/**/
     3426,
 /**/
     3425,