move check for std::filesystem and std::optional down

CMakeLists.txt

@@ -59,8 +59,6 @@ include(cmake/target_link_libraries_system.cmake)
 include(cmake/add_import_library.cmake)
 include(cmake/add_log_tag.cmake)
 include(cmake/libatomic.cmake)
-include(cmake/check_for_std_optional.cmake)
-include(cmake/check_for_std_filesystem.cmake)
 
 if (STATIC_LINK AND STATIC_LINK_RUNTIME)
   message(FATAL "Cannot set both STATIC_LINK and STATIC_LINK_RUNTIME")
@@ -99,6 +97,8 @@ set(CMAKE_C_STANDARD_REQUIRED ON)
 set(CMAKE_C_EXTENSIONS OFF)
 
 include(cmake/unix.cmake)
+include(cmake/check_for_std_optional.cmake)
+include(cmake/check_for_std_filesystem.cmake)
 
 if(NOT WIN32)
   if(IOS OR ANDROID)