Try synchronous fetches

Author: joeyparrish

emulator-patches/fetch.c

@@ -163,7 +163,8 @@ static void fetch_range_async(const char* url, size_t first_byte, size_t size,
   emscripten_fetch_attr_init(&fetch_attributes);
 
   strcpy(fetch_attributes.requestMethod, "GET");
-  fetch_attributes.attributes = EMSCRIPTEN_FETCH_LOAD_TO_MEMORY;
+  // ...?
+  fetch_attributes.attributes = EMSCRIPTEN_FETCH_LOAD_TO_MEMORY | EMSCRIPTEN_FETCH_SYNCHRONOUS;
 
   if (ctx->range) {
     const char** headers = malloc(sizeof(char*) * 3);