Fixed iterator definition

[SVN r11299]

include/boost/regex/detail/fileiter.hpp

@@ -193,6 +193,9 @@ public:
 };
 
 class BOOST_REGEX_DECL mapfile_iterator
+#if !defined(BOOST_NO_STD_ITERATOR) || defined(BOOST_MSVC_STD_ITERATOR)
+: public std::iterator<std::random_access_iterator_tag, char>
+#endif
 {
    typedef mapfile::pointer internal_pointer;
    internal_pointer* node;