Fix SPDLOG_FMT_EXTERNAL definition in CMakeLists (#382)

Fix defining the wrong macro for spdlog

Author: interfector18

CMakeLists.txt

@@ -244,7 +244,7 @@ if(USE_SPDLOG)
 endif(USE_SPDLOG)
 if(HAVE_SPDLOG)
   target_link_libraries(${PROJECT_NAME} PUBLIC spdlog::spdlog_header_only)
-  target_compile_definitions(${PROJECT_NAME} PUBLIC TRANTOR_SPDLOG_SUPPORT SPDLOG_FMT_EXTERNAL FMT_HEADER_ONLY)
+  target_compile_definitions(${PROJECT_NAME} PUBLIC TRANTOR_SPDLOG_SUPPORT SPDLOG_FMT_EXTERNAL_HO FMT_HEADER_ONLY)
 endif(HAVE_SPDLOG)
 
 set(HAVE_C-ARES NO)