remove const from pair specialization.

Author: jrhemstad

thrust/detail/pair.inl

@@ -140,21 +140,21 @@ template <typename T1, typename T2>
 
 // specializations of tuple_element for pair
 template<typename T1, typename T2>
-  struct tuple_element<0, pair<T1,T2> const>
+  struct tuple_element<0, pair<T1,T2>>
 {
   typedef T1 type;
 }; // end tuple_element
 
 template<typename T1, typename T2>
-  struct tuple_element<1, pair<T1,T2> const>
+  struct tuple_element<1, pair<T1,T2>>
 {
   typedef T2 type;
 }; // end tuple_element
 
 
 // specialization of tuple_size for pair
 template<typename T1, typename T2>
-  struct tuple_size<pair<T1,T2> const>
+  struct tuple_size<pair<T1,T2>>
 {
   static const unsigned int value = 2;
 }; // end tuple_size