build: Define a dummy _DIAGASSERT
diff --git a/src/md2.c b/src/md2.c
index f409d7b..b01fe60 100644
--- a/src/md2.c
+++ b/src/md2.c
@@ -40,6 +40,8 @@ __RCSID("$NetBSD: md2.c,v 1.7 2012/06/25 22:32:44 abs Exp $");
#include <md2.h>
#include <string.h>
+#define _DIAGASSERT(x)
+
#if !HAVE_MD2_H
/* cut-n-pasted from rfc1319 */