$OpenBSD: patch-src_session_impl_cpp,v 1.1 2018/04/26 11:30:09 sthen Exp $

From 21d8e9e26b377137612c323992d216be50a547bb Mon Sep 17 00:00:00 2001
From: Xiyue Deng <xiyueden@isi.edu>
Date: Mon, 23 Apr 2018 02:17:47 -0700
Subject: [PATCH] Add missing header <cstdarg> for va_list.

--- src/session_impl.cpp.orig
+++ src/session_impl.cpp
@@ -107,6 +107,8 @@ POSSIBILITY OF SUCH DAMAGE.
 // for logging stat layout
 #include "libtorrent/stat.hpp"
 
+#include <cstdarg> // for va_list
+
 // for logging the size of DHT structures
 #ifndef TORRENT_DISABLE_DHT
 #include <libtorrent/kademlifind_data.hpp>
