patch 8.2.2869: using unified diff is not tested

Problem:    Using unified diff is not tested.
Solution:   Test all cases also with unified diff. (issue #8197)
diff --git a/src/version.c b/src/version.c
index 48f7554..0b17d91 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2869,
+/**/
     2868,
 /**/
     2867,