[issue10812] Add some posix functions

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

> According to the spec for gethostname(), the hostname that it returns
> is null-terminated so it won't support embedded NUL bytes. Should we
> still add it anyway?

Oops, I misread the spec. No, gethostname should then not be duplicated.
Putting sethostname into the socket module might be worth considering,
though; I find the proposed split confusing.

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