Compile boost from source to fix macOS wheels (#1688)

src/ray/object_manager/object_manager.cc

@@ -86,7 +86,9 @@ void ObjectManager::SchedulePull(const ObjectID &object_id, int wait_ms) {
   pull_requests_[object_id] = Timer(new boost::asio::deadline_timer(
       io_service_, boost::posix_time::milliseconds(wait_ms)));
   pull_requests_[object_id]->async_wait(
-      boost::bind(&ObjectManager::SchedulePullHandler, this, object_id));
+      [this, object_id](const boost::system::error_code &error_code) {
+        RAY_CHECK_OK(SchedulePullHandler(object_id));
+      });
 }
 
 ray::Status ObjectManager::SchedulePullHandler(const ObjectID &object_id) {

src/ray/raylet/lineage_cache.h

@@ -16,7 +16,7 @@ class LineageCacheEntry {
  private:
   // TODO(swang): This should be an enum of the state of the entry - goes from
   // completely local, to dirty, to in flight, to committed.
-  bool dirty_;
+  // bool dirty_;
 };
 
 class LineageCacheTaskEntry : public LineageCacheEntry {};