patch 8.1.0903: struct uses more bytes than needed

Problem:    Struct uses more bytes than needed.
Solution:   Reorder members of regitem_S. (Dominique Pelle, closes #3936)
diff --git a/src/version.c b/src/version.c
index cadd46e..a6101b5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    903,
+/**/
     902,
 /**/
     901,