internal/syscall/unix: fix number of params for unlinkat
This reverts the change to Unlinkat done in CL 659415, as it appears
to be wrong.
While at it, let's unify argument formatting for better readability
(and also so those parameters are easier to count).
Change-Id: I092105f85de107e0495afed3cd66c039343250f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/659357 Reviewed-by: Damien Neil <dneil@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Damien Neil <dneil@google.com>
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