patch 8.2.3477: startup test fails on MS-Windows

Problem:    Startup test fails on MS-Windows.
Solution:   Skip the test if not on Unix.

src/testdir/test_startup.vim

@@ -1297,6 +1297,8 @@ func Test_echo_true_in_cmd()
 endfunc
 
 func Test_rename_buffer_on_startup()
+  CheckUnix
+
   let lines =<< trim END
       call writefile(['done'], 'Xresult')
       qa!

src/version.c

@@ -757,6 +757,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3477,
 /**/
     3476,
 /**/