message: Fix compilation on GCC 4.9
diff: @@ -46,11 +46,7 @@ public:
  {
  }
  explicit Buffer(size_t initial_size, Allocator& alloc = Allocator::get_default());
  - Buffer(Buffer<T>&&) noexcept = default;
  - ~Buffer() noexcept
  - {
  - }
  -
  + Buffer(Buffer&&) noexcept = default;
  Buffer<T, Allocator>& operator=(Buffer&&) noexcept = default;
  T& operator[](size_t i) noexcept
  @@ -130,10 +126,6 @@ template <class T, class Allocator = DefaultAllocator>
  class AppendBuffer {
  public:
  AppendBuffer(Allocator& alloc = Allocator::get_default()) noexcept;
  - ~AppendBuffer() noexcept
  - {
  - }
  -
  AppendBuffer(AppendBuffer&&) noexcept = default;
  AppendBuffer& operator=(AppendBuffer&&) noexcept = default;
  