implement std::fs::set_permissions_nofollow on unix

[lolbinarycat]

implementation of #141607

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[rust-log-analyzer]

The job x86_64-gnu-miri failed! Check out the build log: (web) (plain)

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[RUSTC-TIMING] object test:false 9.446
error[E0433]: failed to resolve: use of unresolved module or unlinked crate `fs`
   --> library/std/src/sys/fs/mod.rs:112:52
    |
112 | pub fn set_permissions_nofollow(path: &Path, perm: fs::Permissions) -> io::Result<()> {
    |                                                    ^^ use of unresolved module or unlinked crate `fs`
    |
    = help: if you wanted to use a crate named `fs`, use `cargo add fs` to add it to your `Cargo.toml`
help: consider importing one of these modules
    |
3   + use crate::fs;
    |
3   + use crate::os::unix::fs;