patch 9.0.0543: insufficient testing for assert and test functions

Problem:    Insufficient testing for assert and test functions.
Solution:   Add a few more tests. (Yegappan Lakshmanan, closes #11190)
diff --git a/src/version.c b/src/version.c
index d1ed0c4..d369456 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    543,
+/**/
     542,
 /**/
     541,