patch 9.0.0753: some Ex commands are not in the help index

Problem:    Some Ex commands are not in the help index.
Solution:   Add the missing commands.  Add a script to check all Ex commands
            are in the help index. (Yee Cheng Chin, closes #11371)
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index 743da38..04ccb48 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -91,6 +91,7 @@
 	test_cjk_linebreak \
 	test_clientserver \
 	test_close_count \
+	test_cmd_lists \
 	test_cmdline \
 	test_cmdmods \
 	test_cmdwin \
@@ -351,6 +352,7 @@
 	test_cjk_linebreak.res \
 	test_clientserver.res \
 	test_close_count.res \
+	test_cmd_lists.res \
 	test_cmdline.res \
 	test_cmdmods.res \
 	test_cmdwin.res \