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

test/testcontroller.c

@@ -17,13 +17,13 @@
 #include <SDL3/SDL_test.h>
 #include <SDL3/SDL_test_font.h>
 
-#include "gamepadutils.h"
-#include "testutils.h"
-
-#ifdef __EMSCRIPTEN__
+#ifdef SDL_PLATFORM_EMSCRIPTEN
 #include <emscripten/emscripten.h>
 #endif
 
+#include "gamepadutils.h"
+#include "testutils.h"
+
 #if 0
 #define DEBUG_AXIS_MAPPING
 #endif
@@ -1883,7 +1883,7 @@ static void loop(void *arg)
     SDL_Delay(16);
     SDL_RenderPresent(screen);
 
-#ifdef __EMSCRIPTEN__
+#ifdef SDL_PLATFORM_EMSCRIPTEN
     if (done) {
         emscripten_cancel_main_loop();
     }
@@ -2090,7 +2090,7 @@ int main(int argc, char *argv[])
     }
 
     /* Loop, getting gamepad events! */
-#ifdef __EMSCRIPTEN__
+#ifdef SDL_PLATFORM_EMSCRIPTEN
     emscripten_set_main_loop_arg(loop, NULL, 0, 1);
 #else
     while (!done) {