patch 8.1.0267: no good check if restoring quickfix list worked

Problem:    No good check if restoring quickfix list worked.
Solution:   Let qf_restore_list() return OK/FAIL. (Yegappan Lakshmanan)

src/version.c

@@ -794,6 +794,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    267,
 /**/
     266,
 /**/