unix/linux: add TUN flags and virtio_net_hdr constants

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This PR (HEAD: 3e8d734) has been imported to Gerrit for code review.

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Message from Brad Fitzpatrick:

Patch Set 1: Run-TryBot+1

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Patch Set 1:

(1 comment)

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Patch Set 2:

(2 comments)

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Patch Set 2: TryBot-Result+1

(1 comment)

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Message from Ian Lance Taylor:

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

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Message from Tobias Klauser:

Patch Set 2: Code-Review+2

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Message from Brad Fitzpatrick:

Patch Set 2: Run-TryBot+1

(1 comment)

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Message from Bryan Mills:

Patch Set 2: Code-Review+1

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This PR is being closed because golang.org/cl/468656 has been merged.