message: constrained.hpp: fix inconsistent override warnings
diff: @@ -53,7 +53,7 @@ public:
  virtual ~ConstrainedSolver() { }
  - virtual void SetOperator(const Operator& op) { }
  + virtual void SetOperator(const Operator& op) override { }
  /** @brief Set the right-hand side r for the constraint B x = r
  @@ -164,9 +164,9 @@ class EliminationProjection : public Operator
  public:
  EliminationProjection(const Operator& A, Array<Eliminator*>& eliminators);
  - void Mult(const Vector& x, Vector& y) const;
  + void Mult(const Vector& x, Vector& y) const override;
  - void MultTranspose(const Vector& x, Vector& y) const;
  + void MultTranspose(const Vector& x, Vector& y) const override;
  /** @brief Assemble this projector as a (processor-local) SparseMatrix.
  