patch 9.0.0503: build failure

Problem:    Build failure.
Solution:   Add missing changes.
diff --git a/src/version.c b/src/version.c
index 7e22f01..6bd68dc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    503,
+/**/
     502,
 /**/
     501,