security: Remove old security framework

This commit also finalizes removal of CryptoPP dependency.

Change-Id: Ia670cbeaf21b28d3b93fd36bb3781da3ac822662
Refs: #4246, #3946
diff --git a/src/common-pch.hpp b/src/common-pch.hpp
index 16bd531..58c4513 100644
--- a/src/common-pch.hpp
+++ b/src/common-pch.hpp
@@ -1,5 +1,5 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
+/*
  * Copyright (c) 2013-2017 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
@@ -50,7 +50,4 @@
 #include <boost/range/algorithm/copy.hpp>
 #include <boost/regex.hpp>
 
-// Other useful headers to precompile
-#include "security/v1/cryptopp.hpp"
-
 #endif // NDN_COMMON_PCH_HPP