POSIX link() syscall only takes two arguments (no flags)

The signature is documented as:

   int link(const char *, const char *);

(see https://man7.org/linux/man-pages/man2/link.2.html or https://man.netbsd.org/link.2)

And its not some Linux extension, the [syscall
implementation](https://github.com/torvalds/linux/blob/21b136cc63d2a9ddd60d4699552b69c214b32964/fs/namei.c#L4794-L4797)
only expects two arguments too.

It probably *should* have a flags parameter, but its too late now.

I am a bit surprised that linking glibc or musl against code that invokes
a 'link' with three parameters doesn't fail (at least, I couldn't get any
local test cases to trigger a compile or link error).

The test case in std/posix/test.zig is currently disabled, but if I
manually enable it, it works with this change.

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