unix: add IFAL_* consts and ifaddrlblmsg on linux

[juanluisvaladas]

Implments consts and structs related to ifaddrlabel

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Patch Set 1:

(1 comment)

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Message from Juan Valadas:

Patch Set 3:

(1 comment)

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Message from Juan Valadas:

Patch Set 4:

(1 comment)

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Patch Set 4: Code-Review+1

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Patch Set 4: Auto-Submit+1 Code-Review+2 Commit-Queue+1

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Patch Set 4:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-09-02T14:25:07Z","revision":"973ddb9813afc104ad1a637b43473f106a999e64"}

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Patch Set 4: -Commit-Queue

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This CL has passed the run

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Patch Set 4: LUCI-TryBot-Result+1

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Patch Set 4: Code-Review+1

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This PR is being closed because golang.org/cl/683775 has been merged.