Borland workaround. Replace 'add_const<value_type>::type with

'const value_type' in the code which computed the pointer type. Borland
did not property add const type with 'add_const'.


[SVN r27388]

libs/iterator

@@ -1 +1 @@
-Subproject commit 88697aad659d47ca511f4d38b01b54ae6b053f77
+Subproject commit 1d018cc6020fc4a7d5d1ba176916daddfdc14edd