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)
diff --git a/src/version.c b/src/version.c
index 61dfc5f..2e9ecf7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -795,6 +795,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    267,
+/**/
     266,
 /**/
     265,