patch 8.1.1353: undo test fails on Mac

Problem:    Undo test fails on Mac.
Solution:   Expect "private" on the Mac.
diff --git a/src/version.c b/src/version.c
index f349d7b..d163546 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1353,
+/**/
     1352,
 /**/
     1351,