patch 8.0.0424: compiler warnings on MS-Windows

Problem:    Compiler warnings on MS-Windows. (Ajit Thakkar)
Solution:   Add type casts.
diff --git a/src/version.c b/src/version.c
index c956389..b9d3d1e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    424,
+/**/
     423,
 /**/
     422,