message: Actually fix the build
diff: #endif
  #include <memory>
  +#include <functional>
  namespace realm {
  class BindingContext;
  @@ -392,7 +393,9 @@ private:
  void cache_new_schema();
  void notify_schema_changed();
  +#if REALM_ENABLE_SYNC
  std::unique_ptr<PartialSyncHelper> m_partial_sync_helper;
  +#endif
  public:
  std::unique_ptr<BindingContext> m_binding_context;
  