Minor fixes in 1984/anonymous

The anonymous.c no longer triggers a warning that can't be disabled
(added 'int' before 'i' which is how it was in the original anyway).

Minor fix in the README.md.

1984/anonymous/README.md

@@ -31,8 +31,9 @@ make alt
 
 #### To run:
 
+NOTE: this version might not work on some systems like macOS.
+
 ```sh
-echo NOTE: this version might not work on some systems.
 ./anonymous.alt
 ```