patch 8.1.0703: compiler warnings with 64-bit compiler

Problem:    Compiler warnings with 64-bit compiler.
Solution:   Change types, add type casts. (Mike Williams)
diff --git a/src/version.c b/src/version.c
index 13f7909..0693be1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    703,
+/**/
     702,
 /**/
     701,