patch 8.2.0881: compiler warning for argument type

Problem:    Compiler warning for argument type.
Solution:   Add type cast. (Mike Williams)
diff --git a/src/version.c b/src/version.c
index 3a74509..e4641dc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    881,
+/**/
     880,
 /**/
     879,