patch 8.0.0406: arabic shaping code is verbose

Problem:    The arabic shaping code is verbose.
Solution:   Shorten the code without changing the functionality.
diff --git a/src/version.c b/src/version.c
index c4ef6ac..cc69b3c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    406,
+/**/
     405,
 /**/
     404,