patch 9.0.0475: not using deferred delete in tests

Problem:    Not using deferred delete in tests.
Solution:   Use deferred delete more often.
diff --git a/src/version.c b/src/version.c
index 291fc05..ae74081 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    475,
+/**/
     474,
 /**/
     473,