Changed projection_iterator to not rely on the default reference,

working around a limitation of detail::iterator_traits


[SVN r11340]

libs/iterator

@@ -1 +1 @@
-Subproject commit 2d6f48d5abfd8c736dcf41dd70a17a7492ae15ea
+Subproject commit 3fd1c4bc5d0eb522296383b05bd245def53dc9b6