Fixed emscripten and iOS builds

src/main/emscripten/SDL_sysmain_callbacks.c

@@ -26,7 +26,7 @@
 
 static void EmscriptenInternalMainloop(void)
 {
-    const int rc = SDL_IterateMainCallbacks();
+    const int rc = SDL_IterateMainCallbacks(SDL_TRUE);
     if (rc != 0) {
         SDL_QuitMainCallbacks();
         emscripten_cancel_main_loop();  // kill" the mainloop, so it stops calling back into it.

src/main/ios/SDL_sysmain_callbacks.m

@@ -47,7 +47,7 @@ static SDLIosMainCallbacksDisplayLink *globalDisplayLink;
 
 - (void)appIteration:(CADisplayLink *)sender
 {
-    const int rc = SDL_IterateMainCallbacks();
+    const int rc = SDL_IterateMainCallbacks(SDL_TRUE);
     if (rc != 0) {
         [self.displayLink invalidate];
         self.displayLink = nil;