ARGV should be able to be either string or bytes

Example C code:
```c
#include <stdio.h> 
#include <string.h> 
 
int main(int argc, char *argv[]) { 
    printf("%d\n", strlen(argv[1])); 
    return 0; 
}
```

```python
from qiling import Qiling 
 
ql = Qiling(["a.out", "AAAA"], rootfs="/") 
ql.run() 
 
ql = Qiling(["a.out", b"\x80\x80\x80\x80"], rootfs="/") 
ql.run()
```

results should be identical 
