windows: add constants for PMTUD socket options

[database64128]

Related documentation:

• https://learn.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options
• https://learn.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Ian Chen:

Patch Set 1:

(1 comment)

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Message from Quim Muntal:

Patch Set 1: Code-Review+2 Commit-Queue+1

(1 comment)

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Message from Go LUCI:

Patch Set 1:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-03-04T07:56:07Z","revision":"8be1f32c21f140f77226a68c5ff435fda9607a90"}

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Message from Quim Muntal:

Patch Set 1: -Commit-Queue

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Message from Go LUCI:

Patch Set 1:

This CL has passed the run

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Patch Set 1: LUCI-TryBot-Result+1

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Message from Ian Lance Taylor:

Patch Set 1: Auto-Submit+1 Code-Review+1

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This PR is being closed because golang.org/cl/654495 has been merged.