src: minor updates to common.hpp and common-pch.hpp

Also remove redundant includes.

Change-Id: I0e1f55abcf852b95a4fd8c9a0e3a30aa153f892c
diff --git a/src/encoding/tlv.hpp b/src/encoding/tlv.hpp
index c9a6520..b15ec14 100644
--- a/src/encoding/tlv.hpp
+++ b/src/encoding/tlv.hpp
@@ -22,14 +22,12 @@
 #ifndef NDN_ENCODING_TLV_HPP
 #define NDN_ENCODING_TLV_HPP
 
-#include <stdexcept>
-#include <iostream>
-#include <iterator>
-#include <limits>
-
 #include "buffer.hpp"
 #include "endian.hpp"
 
+#include <iostream>
+#include <iterator>
+
 namespace ndn {
 
 /** @brief practical limit of network layer packet size