patch 8.0.0541: compiler warning on MS-Windows

Problem:    Compiler warning on MS-Windows.
Solution:   Add a type cast. (Mike Williams)
diff --git a/src/version.c b/src/version.c
index 5958550..eef36b4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    541,
+/**/
     540,
 /**/
     539,