time: add /etc/zoneinfo as valid path for tzdata for NixOS

[danderson]

NixOS has no /usr/share, but does have tzdata at /etc/zoneinfo.

[gopherbot]

This PR (HEAD: 9969dd3e2cc49b30c3cd6b0858cb60b00bcbdf60) has been imported to Gerrit for code review.

Please visit https://go-review.googlesource.com/c/go/+/464995 to see it.

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[gopherbot]

Message from Brad Fitzpatrick:

Patch Set 1: Code-Review+2

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Please don’t reply on this GitHub thread. Visit golang.org/cl/464995. After addressing review feedback, remember to publish your drafts!

[gopherbot]

Message from Brad Fitzpatrick:

Patch Set 1: Run-TryBot+1

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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[gopherbot]

Message from Gopher Robot:

Patch Set 1: TryBot-Result+1

(1 comment)

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[gopherbot]

Message from Michael Knyszek:

Patch Set 1: Code-Review+1

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[gopherbot]

Message from Dmitri Shuralyov:

Patch Set 1: Code-Review+1

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[gopherbot]

This PR is being closed because golang.org/cl/464995 has been merged.