patch 8.1.0628: Compiler warning on MS-Windows.

Problem:    Compiler warning on MS-Windows.
Solution:   Add type cast. (Mike Williams)
diff --git a/src/version.c b/src/version.c
index 101d786..ff22c6d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    628,
+/**/
     627,
 /**/
     626,