fix MSVC7.1 compile failure by free function begin(it, type) and end(it, type) instead of the member functions of '''it'''

[SVN r56619]

libs/numeric/ublas

@@ -1 +1 @@
-Subproject commit 6dc7cd239bd126594557cd377a58a224236a6e52
+Subproject commit e78eefd0dbc89d0223e8ca1c3de2e1e9bd989d41