patch 8.0.1157: compiler warning on MS-Windows

Problem:    Compiler warning on MS-Windows.
Solution:   Add type cast. (Yasuhiro Matsomoto)
diff --git a/src/version.c b/src/version.c
index 902b05c..cf76f81 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1157,
+/**/
     1156,
 /**/
     1155,