patch 9.0.0475: not using deferred delete in tests

Problem:    Not using deferred delete in tests.
Solution:   Use deferred delete more often.

src/version.c

@@ -703,6 +703,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    475,
 /**/
     474,
 /**/