Updates to a number of apps to remove warnings/compile errors under libc5.

Tested under both libc5 and libc6 and all seems well with these fixes.
 -Erik

coreutils/dirname.c

@@ -45,5 +45,5 @@ extern int dirname_main(int argc, char **argv)
 	if (s && *s)
 		*s = '\0';
 	printf("%s\n", (s)? *argv : ".");
-	exit(TRUE);
+	return(TRUE);
 }