build+src: Updating common.hpp to import (std|boost)::(shared_ptr|function|...) into ndn namespace

Also fixing a small bug in wscript.

Change-Id: I8f20caa177cc015b7433d1ecd3db385f533437c6
diff --git a/src/encoding/cryptopp/asn_ext.hpp b/src/encoding/cryptopp/asn_ext.hpp
index c53cb96..d344edc 100644
--- a/src/encoding/cryptopp/asn_ext.hpp
+++ b/src/encoding/cryptopp/asn_ext.hpp
@@ -23,7 +23,7 @@
 #endif
 
 #include <stdexcept>
-#include "common.hpp"
+#include "../../common.hpp"
 #include <cryptopp/asn.h>
 
 namespace ndn {