testnative: include SDL_build_config.h instead of SDL_internal.h

test/testnative.h

@@ -13,16 +13,10 @@
 /* Definitions for platform dependent windowing functions to test SDL
    integration with native windows
 */
+
 #include <SDL3/SDL.h>
 
-/* Hack to avoid dynapi renaming */
-#include "../src/dynapi/SDL_dynapi.h"
-#ifdef SDL_DYNAMIC_API
-#undef SDL_DYNAMIC_API
-#endif
-#define SDL_DYNAMIC_API 0
-
-#include "../src/SDL_internal.h"
+#include "build_config/SDL_build_config.h"
 
 typedef struct
 {