Revert "Remove unused deprecated includes"

This reverts commit b2b9ab1568.

include/boost/pending/detail/int_iterator.hpp

@@ -6,12 +6,11 @@
 #ifndef BOOST_INT_ITERATOR_H
 #define BOOST_INT_ITERATOR_H
 
+#include <boost/iterator.hpp>
 #if !defined BOOST_MSVC
 #include <boost/operators.hpp>
 #endif
 #include <iostream>
-#include <iterator>
-#include <cstddef>
 //using namespace std;
 
 #ifndef BOOST_NO_OPERATORS_IN_NAMESPACE