patch 8.2.2884: not enough cscope code is covered by tests

Problem:    Not enough cscope code is covered by tests.
Solution:   Add a few test cases. (Dominique Pellé, closes #8246)
diff --git a/src/version.c b/src/version.c
index 517e832..c0729b2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2884,
+/**/
     2883,
 /**/
     2882,