replace ndarray by c-style array

for device support with clang and CUDA 11

Author: tjhei

include/deal.II/base/symmetric_tensor.h

@@ -1986,23 +1986,22 @@ namespace internal
             }
           case 2:
             {
-              constexpr dealii::ndarray<unsigned int, 2, 2> table = {
-                {{{0, 2}}, {{2, 1}}}};
+              constexpr unsigned int table[2][2] = {{0, 2}, {2, 1}};
               return table[indices[0]][indices[1]];
             }
           case 3:
             {
-              constexpr dealii::ndarray<unsigned int, 3, 3> table = {
-                {{{0, 3, 4}}, {{3, 1, 5}}, {{4, 5, 2}}}};
+              constexpr unsigned int table[3][3] = {{0, 3, 4},
+                                                    {3, 1, 5},
+                                                    {4, 5, 2}};
               return table[indices[0]][indices[1]];
             }
           case 4:
             {
-              constexpr dealii::ndarray<unsigned int, 4, 4> table = {
-                {{{0, 4, 5, 6}},
-                 {{4, 1, 7, 8}},
-                 {{5, 7, 2, 9}},
-                 {{6, 8, 9, 3}}}};
+              constexpr unsigned int table[4][4] = {{0, 4, 5, 6},
+                                                    {4, 1, 7, 8},
+                                                    {5, 7, 2, 9},
+                                                    {6, 8, 9, 3}};
               return table[indices[0]][indices[1]];
             }
           default: