message: Remove another using statement in coefficient.hpp
diff: @@ -1347,7 +1347,6 @@ public:
  ///Construct using matrix @a m for the constant.
  SymmetricMatrixConstantCoefficient(const DenseSymmetricMatrix &m)
  : SymmetricMatrixCoefficient(m.Height()), mat(m) { }
  - using MatrixCoefficient::Eval;
  using SymmetricMatrixCoefficient::Eval;
  /// Evaluate the matrix coefficient at @a ip.
  virtual void Eval(DenseSymmetricMatrix &M, ElementTransformation &T,
  