[Build] Fix symbol problems (ray-project#15187)

src/ray/core_worker/core_worker.cc

@@ -671,7 +671,7 @@ CoreWorker::CoreWorker(const CoreWorkerOptions &options, const WorkerID &worker_
 
  // Start the IO thread after all other members have been initialized, in case
  // the thread calls back into any of our members.
- io_thread_ = std::thread(&CoreWorker::RunIOService, this);
+ io_thread_ = std::thread([this]() { RunIOService(); });
  // Tell the raylet the port that we are listening on.
  // NOTE: This also marks the worker as available in Raylet. We do this at the
  // very end in case there is a problem during construction.

src/ray/object_manager/plasma/client.cc

@@ -49,7 +49,7 @@ using fb::PlasmaError;
 
 /// A Buffer class that automatically releases the backing plasma object
 /// when it goes out of scope. This is returned by Get.
-class RAY_NO_EXPORT PlasmaBuffer : public SharedMemoryBuffer {
+class PlasmaBuffer : public SharedMemoryBuffer {
  public:
  ~PlasmaBuffer();