x/sys/unix: add missing ETHTOOL_FLAG_ constants

[mauri870]

Some constants were removed in CL 600516 that included changes for the
Linux kernel 6.10.

This kernel version moved C defines to an enum ethtool_header_flags that
was not picked up by the mkall.sh script.

For enums, there is a perl script that needs to be run manually, and the
output must be added by hand to the list of constants in unix/linux/types.go.

See https://elixir.bootlin.com/linux/v6.10.3/source/include/uapi/linux/ethtool_netlink.h#L120

Fixes golang/go#68761

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Message from Ian Lance Taylor:

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

(1 comment)

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Message from Go LUCI:

Patch Set 2:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2024-08-07T20:57:49Z","revision":"a314f1ec628ece4b0abf1e4e33596ea60cb3f9f2"}

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Message from Ian Lance Taylor:

Patch Set 2: -Commit-Queue

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Patch Set 2:

This CL has passed the run

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Patch Set 2: LUCI-TryBot-Result+1

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This PR is being closed because golang.org/cl/604098 has been merged.