build: require gcc >= 5.3, boost >= 1.58, openssl >= 1.0.2

This effectively drops support for all versions of Ubuntu older than 16.04

Change-Id: Ie3ab7df9147e97f6467658a6399a4f9379f089c1
Refs: #4462
diff --git a/src/encoding/buffer.cpp b/src/encoding/buffer.cpp
index ce4c880..531e9fa 100644
--- a/src/encoding/buffer.cpp
+++ b/src/encoding/buffer.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2013-2017 Regents of the University of California.
+ * Copyright (c) 2013-2018 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -25,15 +25,10 @@
 
 namespace ndn {
 
-#if NDN_CXX_HAVE_IS_NOTHROW_MOVE_CONSTRUCTIBLE
 static_assert(std::is_nothrow_move_constructible<Buffer>::value,
               "Buffer must be MoveConstructible with noexcept");
-#endif // NDN_CXX_HAVE_IS_NOTHROW_MOVE_CONSTRUCTIBLE
-
-#if NDN_CXX_HAVE_IS_NOTHROW_MOVE_ASSIGNABLE
 static_assert(std::is_nothrow_move_assignable<Buffer>::value,
               "Buffer must be MoveAssignable with noexcept");
-#endif // NDN_CXX_HAVE_IS_NOTHROW_MOVE_ASSIGNABLE
 
 Buffer::Buffer() = default;