patch 9.0.1142: crash and/or memory leak when redefining function

Problem:    Crash and/or memory leak when redefining function after error.
Solution:   Clear pointer after making a copy.  Clear arrays on failure.
            (closes #11774)

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1142,
 /**/
     1141,
 /**/