patch 7.4.1971

Problem:    It is not easy to see unrecognized error lines below the current
            error position.
Solution:   Add ":clist +count".

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1971,
 /**/
     1970,
 /**/