patch 8.1.1326: no test for listener with partial

Problem:    No test for listener with partial.
Solution:   Add a test.  Add example to help.

src/version.c

@@ -767,6 +767,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1326,
 /**/
     1325,
 /**/