security: Add base64 and hex encoding/decoding support in transformation

Change-Id: I11d5c8921abcf04411aac38382dc285269f553ef
Refs: #3009
diff --git a/src/security/transform.hpp b/src/security/transform.hpp
index b29f5c6..b9a960c 100644
--- a/src/security/transform.hpp
+++ b/src/security/transform.hpp
@@ -29,4 +29,9 @@
 #include "transform/bool-sink.hpp"
 #include "transform/stream-sink.hpp"
 
+#include "transform/hex-encode.hpp"
+#include "transform/hex-decode.hpp"
+#include "transform/base64-encode.hpp"
+#include "transform/base64-decode.hpp"
+
 #endif // NDN_CXX_SECURITY_TRANSFORM_HPP