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/testdir/test_undo.vim b/src/testdir/test_undo.vim
index ba1c861..1440660 100644
--- a/src/testdir/test_undo.vim
+++ b/src/testdir/test_undo.vim
@@ -442,7 +442,11 @@
 
   if isdirectory('/tmp')
     set undodir=/tmp
-    call assert_equal('/tmp/%tmp%file', undofile('///tmp/file'))
+    if has('osx')
+      call assert_equal('/tmp/%private%tmp%file', undofile('///tmp/file'))
+    else
+      call assert_equal('/tmp/%tmp%file', undofile('///tmp/file'))
+    endif
   endif
 
   set undodir&
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,