patch 8.0.0462: failure of an MS-Windows test may go unnoticed

Problem:    If an MS-Windows tests succeeds at first and then fails in a way
            it does not produce a test.out file it looks like the test
            succeeded.
Solution:   Delete the previous output file.

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    462,
 /**/
     461,
 /**/