"Cannot set timing mode for main loop" & "You should use 0 for the frame rate in emscripten_set_main_loop"

With the following program…:

```c++
#include
#include

void iterate()
{
}

int main(int, char**)
{
auto pwindow = SDL_CreateWindow
(
"Test",
SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
640,
480,
SDL_WINDOW_RESIZABLE
);

auto prenderer = SDL_CreateRenderer
(
pwindow,
-1,
0
);

emscripten_set_main_loop(iterate, 0, 1);

return 0;
}
```

… I get the following error in the web console: `emscripten_set_main_loop_timing: Cannot set timing mode for main loop since a main loop does not exist! Call emscripten_set_main_loop first to set one up.`

Since `emscripten_set_main_loop_timing` seems to be called by `SDL_CreateRenderer`, I try to fix my program like so:

```c++
#include
#include

void iterate()
{
SDL_Window* pwindow;
SDL_Renderer* prenderer;
static auto first_call = true;

if(first_call)
{
pwindow = SDL_CreateWindow
(
"Test",
SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
640,
480,
SDL_WINDOW_RESIZABLE
);

prenderer = SDL_CreateRenderer
(
pwindow,
-1,
0
);

first_call = false;
}
}

int main(int, char**)
{
emscripten_set_main_loop(iterate, 0, 1);

return 0;
}
```

But now I get the following warning in the web console: `Looks like you are rendering without using requestAnimationFrame for the main loop. You should use 0 for the frame rate in emscripten_set_main_loop in order to use requestAnimationFrame, as that can greatly improve your frame rates!`

It seems like there's no way to get neither of those errors.