update spdlog (it still dont work), fix 6.3(1)

vendor/spdlog/details/backtracer.h

@@ -3,20 +3,19 @@
 
 #pragma once
 
-#include <spdlog/details/log_msg_buffer.h>
 #include <spdlog/details/circular_q.h>
+#include <spdlog/details/log_msg_buffer.h>
 
 #include <atomic>
-#include <mutex>
 #include <functional>
+#include <mutex>
 
 // Store log messages in circular buffer.
 // Useful for storing debug data in case of error/warning happens.
 
 namespace spdlog {
 namespace details {
-class SPDLOG_API backtracer
-{
+class SPDLOG_API backtracer {
     mutable std::mutex mutex_;
     std::atomic<bool> enabled_{false};
     circular_q<log_msg_buffer> messages_;
@@ -32,14 +31,15 @@ public:
     void disable();
     bool enabled() const;
     void push_back(const log_msg &msg);
+    bool empty() const;
 
     // pop all items in the q and apply the given fun on each of them.
     void foreach_pop(std::function<void(const details::log_msg &)> fun);
 };
 
-} // namespace details
-} // namespace spdlog
+}  // namespace details
+}  // namespace spdlog
 
 #ifdef SPDLOG_HEADER_ONLY
-#    include "backtracer-inl.h"
+    #include "backtracer-inl.h"
 #endif