patch 8.1.2319: compiler warning for int size

Problem:    Compiler warning for int size.
Solution:   Add typecast. (Mike Williams)
diff --git a/src/version.c b/src/version.c
index 1adf523..bbc74f3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2319,
+/**/
     2318,
 /**/
     2317,