Description: avoid non-portable __unused attribute
Author: Mark Heily <mark@heily.com>

Index: libdispatch-0.0/testing/dispatch_after.c
===================================================================
--- libdispatch-0.0.orig/testing/dispatch_after.c	2010-07-05 16:44:20.000000000 -0400
+++ libdispatch-0.0/testing/dispatch_after.c	2010-07-05 16:44:37.000000000 -0400
@@ -29,7 +29,7 @@
 #include "dispatch_test.h"
 #include <Block.h>
 
-void done(void *arg __unused) {
+void done(void *arg __attribute__((unused))) {
     sleep(1);
     test_stop();
 }
