syscall: fix ioctl return 0 but isatty() needs non zero #48
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在跑python脚本时，python进入交互模式。原因是isatty()调用ioctl，request参数为TIOCGWINSZ，当返回值为0时进入交互模式；非零时进入脚本模式。
主要改动：
修改trait FileIO的ioctl返回类型；
增加filedesc的ioctl实现；
增加stdout, stderr的ioctl实现；
增加syscall SYMLINKAT，直接返回Ok（0）