patch 9.0.0525: manually deleting temp test files

Problem:    Manually deleting temp test files.
Solution:   Add the 'D' flag to writefile().
diff --git a/src/version.c b/src/version.c
index 40273fc..bdeb67e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    525,
+/**/
     524,
 /**/
     523,