unix: fix unused import in syscall_darwin_386.go

[itchyny]

Fix a compile error due to unused import introduced by CL 154663.

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Patch Set 1:

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This PR (HEAD: 5c7065d) has been imported to Gerrit for code review.

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Message from Tobias Klauser:

Patch Set 3:

(2 comments)

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Message from Tobias Klauser:

Patch Set 4: Run-TryBot+1 Code-Review+2

Thanks

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Message from Gobot Gobot:

Patch Set 4:

TryBots beginning. Status page: https://farmer.golang.org/try?commit=3f4aa6a9

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Patch Set 4: TryBot-Result+1

TryBots are happy.

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This PR is being closed because golang.org/cl/155460 has been merged.