patch 8.2.3956: duplicate assignment

Problem:    Duplicate assignment.
Solution:   Remove the second assignment. (closes #9442)
diff --git a/src/version.c b/src/version.c
index 8505282..d623c58 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3956,
+/**/
     3955,
 /**/
     3954,