patch 8.0.1590: padding in list type wastes memory

Problem:    Padding in list type wastes memory.
Solution:   Reorder struct members to optimize padding. (Dominique Pelle,
            closes #2704)
diff --git a/src/version.c b/src/version.c
index d21b8b1..21b9cdc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -767,6 +767,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1590,
+/**/
     1589,
 /**/
     1588,