patch 8.2.0576: some errors are not covered by tests

Problem:    Some errors are not covered by tests.
Solution:   Add a few more tests. (Dominique Pelle, closes #5920)
diff --git a/src/version.c b/src/version.c
index 0705e75..d5b6a05 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    576,
+/**/
     575,
 /**/
     574,