patch 8.2.0251: a couple of function return types can be more specific

Problem:    A couple of function return types can be more specific.
Solution:   Use a better return type. (Ken Takata, closes #5629)
diff --git a/src/version.c b/src/version.c
index a28fc03..8d43c79 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    251,
+/**/
     250,
 /**/
     249,