patch 8.2.4696: delete() with "rf" argument does not report a failure

Problem:    delete() with "rf" argument does not report a failure.
Solution:   Return -1 if the directory could not be removed. (closes #10078)
diff --git a/src/version.c b/src/version.c
index f4d300b..0e42966 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4696,
+/**/
     4695,
 /**/
     4694,