bug#47596: File descriptor error when exiting emacs on android 11

[Henrik Grimler <henrik@grimler.se>]

Hi again,


> Compiling this, on any optimisation level, is enough to trigger the
> error:
> 
> ```
> #include <stdio.h>
> int main()
> {
>   fdopen (2, "w");
>   fclose (stderr);
> }
> ```

Changing to this:

```

#include <stdio.h>
int main()
{
  FILE *err = fdopen (2, "w");
  fclose (err);
}
```

makes it work. So I suppose the sanitizer does not like that stderr is
closed with `fclose (stderr)` instead of by using the fd obtained from
fdopen (which was thrown away in my minimal example). 

Still not sure if this is actually problematic, but at least now I
understand how the sanitizer "thinks".

Best regards,
Henrik Grimler