File fix-build.patch of Package barrier

Index: barrier-2.4.0/src/lib/base/Event.h
===================================================================
--- barrier-2.4.0.orig/src/lib/base/Event.h
+++ barrier-2.4.0/src/lib/base/Event.h
@@ -18,6 +18,7 @@
 
 #pragma once
 
+#include <cstddef>
 #include "common/basic_types.h"
 #include "common/stdmap.h"