patch 9.0.1178: a child class cannot override functions from a base class

Problem:    A child class cannot override functions from a base class.
Solution:   Allow overriding and implement "super".

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1178,
 /**/
     1177,
 /**/