patch 8.1.0068: nasty autocommands can still cause using freed memory

Problem:    Nasty autocommands can still cause using freed memory.
Solution:   Disallow using setloclist() and setqflist() recursively.

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    68,
 /**/
     67,
 /**/