Upgrade the underlying NFD and ndn-cxx to version 0.6.0

Compilation is currently broken and is fixed in the following commit

Change-Id: Ic0dba06a9afd66a810172d4a512f35f6df6b25a2
Refs: #4306
diff --git a/examples/ndn-simple-for-nrt-helper/requester-app.cpp b/examples/ndn-simple-for-nrt-helper/requester-app.cpp
index 6eee63c..4a5d2ff 100644
--- a/examples/ndn-simple-for-nrt-helper/requester-app.cpp
+++ b/examples/ndn-simple-for-nrt-helper/requester-app.cpp
@@ -90,7 +90,7 @@
     auto interest = make_shared<Interest>(m_name);
     interest->setInterestLifetime(time::seconds(1));
     if (m_delegation.size() > 0) {
-      interest->setLink(m_link.wireEncode());
+      interest->setForwardingHint(m_link.getDelegationList());
     }
 
     NS_LOG_DEBUG("Sending an Interest for "<< *interest);