Fix cmake

CMakeLists.txt

@@ -157,7 +157,6 @@ set(SPDLOG_HEADERS
     "include/spdlog/details/mpmc_blocking_q.h"
     "include/spdlog/details/null_mutex.h"
     "include/spdlog/details/os.h"
-    "include/spdlog/details/periodic_worker.h"
     "include/spdlog/details/context.h"
     "include/spdlog/fmt/bin_to_hex.h"
     "include/spdlog/fmt/fmt.h"
@@ -204,8 +203,7 @@ if(WIN32)
     list(APPEND SPDLOG_SRCS
         "src/details/os_windows.cpp"
         "src/sinks/wincolor_sink.cpp")
-    list(
+    list(APPEND SPDLOG_HEADERS
-        APPEND SPDLOG_HEADERS
         "include/spdlog/sinks/wincolor_sink.h"
         "include/spdlog/details/tcp_client_windows.h"
         "include/spdlog/details/udp_client_windows.h"