Fix unordered_map declarations.

Cython/Includes/libcpp/unordered_map.pxd

@@ -43,13 +43,13 @@ cdef extern from "<unordered_map>" namespace "std" nogil:
         void erase(iterator, iterator)
         size_t erase(T&)
         iterator find(T&)
-        const_iterator const_find "find"(key_type&)
+        const_iterator const_find "find"(T&)
         pair[iterator, bint] insert(pair[T, U]) # XXX pair[T,U]&
         iterator insert(iterator, pair[T, U]) # XXX pair[T,U]&
         #void insert(input_iterator, input_iterator)
         #key_compare key_comp()
         iterator lower_bound(T&)
-        const_iterator const_lower_bound "lower_bound"(key_type&)
+        const_iterator const_lower_bound "lower_bound"(T&)
         size_t max_size()
         reverse_iterator rbegin()
         const_reverse_iterator const_rbegin "rbegin"()
@@ -58,7 +58,7 @@ cdef extern from "<unordered_map>" namespace "std" nogil:
         size_t size()
         void swap(unordered_map&)
         iterator upper_bound(T&)
-        const_iterator const_upper_bound "upper_bound"(key_type&)
+        const_iterator const_upper_bound "upper_bound"(T&)
         #value_compare value_comp()
         void max_load_factor(float)
         float max_load_factor()