libdelimit, Makefile: adds test for libdelimit, changes API; fop(1): changes to new libdelimit API

src/fop.rs

@@ -92,7 +92,7 @@ fn main() -> ExitCode {
 		exit(usage(&argv[0]).into());
 	});
 
-	let stdin = Box::new(stdin().lock());
+	let stdin = stdin().lock();
 
 	let mut input = Delimited::new(stdin, d.clone().as_bytes());
 	let mut n = 0;