patch 8.2.2738: extending a list with itself can give wrong result

Problem:    Extending a list with itself can give wrong result.
Solution:   Remember the item before where the insertion happens and skip to
            after the already inserted items. (closes #1112)
diff --git a/src/version.c b/src/version.c
index 1a1f237..452565c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2738,
+/**/
     2737,
 /**/
     2736,