Fixed issue that "inappropriate ioctl for device"

[Code-Hex]

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[buger]

Thank you for the PR!

There is few things I would like to point. First of all, GetSize function from crypto/ssh/terminal are really small https://github.com/golang/crypto/blob/master/ssh/terminal/util.go#L80, and we can just copy paste code from there. I do not think this package dependency is necessary.

Also I'm not sure that removing terminal_nosysioctl.go will work, crypto/ssh/terminal does not handle systems which do not support ioctl calls. Make sense to leave it as it is.

Thank you!.