core+daemon: declare all equality operators as hidden friends

Change-Id: Id832ee1fb16fb6742879c8b87f56002f94745103

daemon/table/name-tree-iterator.cpp

@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2022,  Regents of the University of California,
+ * Copyright (c) 2014-2023,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -64,12 +64,6 @@ Iterator::operator++(int)
   return copy;
 }
 
-bool
-Iterator::operator==(const Iterator& other) const
-{
-  return m_entry == other.m_entry;
-}
-
 std::ostream&
 operator<<(std::ostream& os, const Iterator& i)
 {