fix msvc warning (implicit cast)

tbox/src/wMumpsInterface.cpp

@@ -47,8 +47,8 @@ void MumpsInterface::setSoE(gmm::csr_matrix<double> const &A, std::vector<double
         for (size_t j = 0; j < nc; ++j)
             if (A(i, j) != 0.)
             {
-                rows.push_back(i + 1);
-                cols.push_back(j + 1);
+                rows.push_back(static_cast<MUMPS_INT>(i + 1));
+                cols.push_back(static_cast<MUMPS_INT>(j + 1));
                 matx.push_back(A(i, j));
             }
     // Set sizes