patch 9.0.1468: recursively calling :defer function if it does :qa

Problem:    Recursively calling :defer function if it does :qa in a compiled
            function.
Solution:   Clear the defer entry before calling the function. (closes #12271)

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1468,
 /**/
     1467,
 /**/