C: `start` function fails to run if `time` is used 
wasm4 version: 
- 2.0.0

When the `srand(time(NULL))` line is used in the `start` function, the function does not seem to run. Because of it, the browser version of the program freezes and the native version does not output any trace.

Code to reproduce:
```c
#include <time.h>
#include <stdlib.h>
#include "wasm4.h"

void start () {
    trace("Hello start!");
    srand(time(NULL));
    trace("Hello start 2!");
}
```
The first and the second `trace` will not work without commenting the `srand` line 