Merge #1278

1278: Allow both &[CString] and &[&CStr] for sequence args in unistd r=asomers a=youknowone

I am new to this project, so I wonder this kind of change is acceptable for the project or not.

I agree taking `&[&CStr]` is the ideal way for the functions. But unfortunately, when users generate `CString`s from `&str`,  they may get `&[CString]` rather than `&[&CStr]`
Unlike single `CString` to `&CStr` argument, there is no easy way to convert `&[CString]` to `&[&CStr]` without creating new vector.

By changing the type from `&[&CStr]` to `&[AsRef<CStr>]`, the args now can take both `&[CString]` and `&[&CStr]` without changing that much from nix.

Co-authored-by: Jeong YunWon <jeong@youknowone.org>

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