fixed compilation

additional "typename" disambiguifiers  are required by some compilers

Author: chacha21

modules/cudev/include/opencv2/cudev/functional/functional.hpp

@@ -621,7 +621,7 @@ template <typename T> struct magnitude_func : binary_function<T, T, typename fun
 
 template <typename T2> struct magnitude_interleaved_func : unary_function<T2, typename VecTraits<T2>::elem_type>
 {
-    typedef VecTraits<T2>::elem_type T;
+    typedef typename VecTraits<T2>::elem_type T;
     __device__ __forceinline__ typename T operator ()(typename TypeTraits<T2>::parameter_type ab) const
     {
         sqrt_func<typename functional_detail::FloatType<T>::type> f;
@@ -639,7 +639,7 @@ template <typename T> struct magnitude_sqr_func : binary_function<T, T, typename
 
 template <typename T2> struct magnitude_sqr_interleaved_func : unary_function<T2, typename VecTraits<T2>::elem_type>
 {
-    typedef VecTraits<T2>::elem_type T;
+    typedef typename VecTraits<T2>::elem_type T;
     __device__ __forceinline__ typename T operator ()(typename TypeTraits<T2>::parameter_type ab) const
     {
         return ab.x * ab.x + ab.y * ab.y;