patch 8.2.3496: crypt test fails if xxd was not installed yet

Problem:    Crypt test fails on MS-Windows if xxd was not installed yet.
Solution:   Use the just built xxd executable if it exists. (James McCoy,
            closes #8929)
diff --git a/src/version.c b/src/version.c
index 2ef2946..8a97806 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3496,
+/**/
     3495,
 /**/
     3494,