unix: fix last argument of pselect6 on linux

[mauri870]

On Linux, the last argument of pselect6 system call is not a
sigseg_t * pointer, but instead it is a structure of the form:

struct {
    const sigset_t *ss;     /* Pointer to signal set */
    size_t          ss_len; /* Size (in bytes) of object pointed
};

See man 2 pselect6.

Fixes #61251

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Patch Set 7: Auto-Submit+1 Code-Review+2 Run-TryBot+1

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