build: prepend "NFD_" to various macro names to avoid conflicts

Change-Id: Icc370968e3d38fef80ece35a2aed56450f54b653
diff --git a/daemon/face/websocket-channel.hpp b/daemon/face/websocket-channel.hpp
index c1b2805..1409289 100644
--- a/daemon/face/websocket-channel.hpp
+++ b/daemon/face/websocket-channel.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2014-2017,  Regents of the University of California,
+/*
+ * Copyright (c) 2014-2021,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -74,7 +74,7 @@
   void
   listen(const FaceCreatedCallback& onFaceCreated);
 
-PUBLIC_WITH_TESTS_ELSE_PRIVATE:
+NFD_PUBLIC_WITH_TESTS_ELSE_PRIVATE:
   /** \pre listen hasn't been invoked
    */
   void