update and change how we build with spdlog

third_party/spdlog/include/spdlog/formatter.h

@@ -1,7 +1,5 @@
-//
-// Copyright(c) 2015 Gabi Melman.
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
 
 #pragma once
 
@@ -14,7 +12,7 @@ class formatter
 {
 public:
     virtual ~formatter() = default;
-    virtual void format(const details::log_msg &msg, fmt::memory_buffer &dest) = 0;
+    virtual void format(const details::log_msg &msg, memory_buf_t &dest) = 0;
     virtual std::unique_ptr<formatter> clone() const = 0;
 };
 } // namespace spdlog