patch 8.2.0260: several lines of code are duplicated

Problem:    Several lines of code are duplicated.
Solution:   Move duplicated code to a function. (Yegappan Lakshmanan,
            closes #5330)
diff --git a/src/version.c b/src/version.c
index 7dacf84..a77a7c8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    260,
+/**/
     259,
 /**/
     258,