Define SDL_PLATFORM_* macros instead of underscored ones (#8875)

test/teststreaming.c

@@ -15,17 +15,17 @@
  *                                                                              *
  ********************************************************************************/
 
-#include <stdlib.h>
-
-#ifdef __EMSCRIPTEN__
-#include <emscripten/emscripten.h>
-#endif
-
 #include <SDL3/SDL.h>
 #include <SDL3/SDL_main.h>
 #include <SDL3/SDL_test.h>
 #include "testutils.h"
 
+#ifdef SDL_PLATFORM_EMSCRIPTEN
+#include <emscripten/emscripten.h>
+#endif
+
+#include <stdlib.h>
+
 #define MOOSEPIC_W 64
 #define MOOSEPIC_H 88
 
@@ -124,7 +124,7 @@ static void loop(void)
     SDL_RenderTexture(renderer, MooseTexture, NULL, NULL);
     SDL_RenderPresent(renderer);
 
-#ifdef __EMSCRIPTEN__
+#ifdef SDL_PLATFORM_EMSCRIPTEN
     if (done) {
         emscripten_cancel_main_loop();
     }
@@ -193,7 +193,7 @@ int main(int argc, char **argv)
     /* Loop, waiting for QUIT or the escape key */
     frame = 0;
 
-#ifdef __EMSCRIPTEN__
+#ifdef SDL_PLATFORM_EMSCRIPTEN
     emscripten_set_main_loop(loop, 0, 1);
 #else
     while (!done) {