removed wait_empty() from tp and q

include/spdlog/details/mpmc_blocking_q.h

@@ -71,13 +71,7 @@ public:
         pop_cv_.notify_one();
         return true;
     }
-
-    // wait until the queue is empty
-    void wait_empty()
-    {
-        std::unique_lock<std::mutex> lock(queue_mutex_);
-        pop_cv_.wait(lock, [this] { return this->q_.empty(); });
-    }
+  
 
 private:
     size_t max_items_;

include/spdlog/details/thread_pool.h

@@ -138,11 +138,7 @@ public:
     {
         return msg_counter_.load(std::memory_order_relaxed);
     }
-
-    void wait_empty()
-    {
-        q_.wait_empty();
-    }
+    
 
 private:
     std::atomic<size_t> msg_counter_; // total # of messages processed in this pool