patch 8.1.2252: compiler warning for int size

Problem:    Compiler warning for int size.
Solution:   Add type cast. (Mike Williams)
diff --git a/src/version.c b/src/version.c
index 767cbec..9b4c386 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2252,
+/**/
     2251,
 /**/
     2250,