Replace remaining uses of BOOST_THROW_EXCEPTION with NDN_THROW

Change-Id: I0c149acbe5607d928cdf9e8d73813d5e74ca45d0
diff --git a/src/route/nexthop.hpp b/src/route/nexthop.hpp
index 7f91cfe..4443a9e 100644
--- a/src/route/nexthop.hpp
+++ b/src/route/nexthop.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2020,  The University of Memphis,
+ * Copyright (c) 2014-2021,  The University of Memphis,
  *                           Regents of the University of California
  *
  * This file is part of NLSR (Named-data Link State Routing).
@@ -27,9 +27,8 @@
 #include <ndn-cxx/encoding/encoding-buffer.hpp>
 #include <ndn-cxx/encoding/tlv.hpp>
 
-#include <iostream>
 #include <cmath>
-#include <boost/cstdint.hpp>
+#include <ostream>
 
 namespace nlsr {