patch 8.1.1235: compiler warnings for using STRLEN() value

Problem:    Compiler warnings for using STRLEN() value.
Solution:   Cast to int. (Christian Brabandt, Mike Williams)
diff --git a/src/version.c b/src/version.c
index c082c06..5cba456 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1235,
+/**/
     1234,
 /**/
     1233,