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/logname.c

@@ -42,5 +42,5 @@ extern int logname_main(int argc, char **argv)
 		exit(TRUE);
 	}
 	fprintf(stderr, "no login name\n");
-	exit(FALSE);
+	return(FALSE);
 }