add main, fix warnings not intended

[cparser] / parsetest / should_fail / kr3.c

extern int k;

int a(first, second, third)
        const char *third;
        float first;
        int second;
        int k;
        float l;
{
        printf("Args: %d %f %s\n", first, second, third);
        return 0;
}

int main(void)
{
        a(42.32, 42, "What is 6 times 9?\n");
        return 0;
}