patch 8.2.2120: not all Perl functionality is tested

Problem:    Not all Perl functionality is tested.
Solution:   Add a few more test cases. (Dominique Pellé, closes #7440)
diff --git a/src/version.c b/src/version.c
index 8e2cf78..9d09c07 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2120,
+/**/
     2119,
 /**/
     2118,