Update SDL2 to the latest commit (85bbf8e)

libs/SDL2/test/testmultiaudio.c

@@ -17,6 +17,8 @@
 #include <emscripten/emscripten.h>
 #endif
 
+#include "testutils.h"
+
 static SDL_AudioSpec spec;
 static Uint8 *sound = NULL;     /* Pointer to wave data */
 static Uint32 soundlen = 0;     /* Length of wave data */
@@ -180,7 +182,7 @@ main(int argc, char **argv)
     if (devcount < 1) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Don't see any specific audio devices!\n");
     } else {
-        const char *file = (argc < 2) ? "sample.wav" : argv[1];
+        char *file = GetResourceFilename(argc > 1 ? argv[1] : NULL, "sample.wav");
 
         /* Load the wave file into memory */
         if (SDL_LoadWAV(file, &spec, &sound, &soundlen) == NULL) {
@@ -190,6 +192,8 @@ main(int argc, char **argv)
             test_multi_audio(devcount);
             SDL_FreeWAV(sound);
         }
+
+        SDL_free(file);
     }
 
     SDL_Quit();