gh-127197: Add NETLINK_* constants to socket module

[rruuaanng]

• Issue: Add latest NETLINK_* constants #127197

Mainly synchronize the latest netlink constants to the socket module.

[picnixz]

I think a NEWS entry could be worthwhile as you previsouly did. There are quite a lot of macros, but you can just say "Add NETLINK_* macros for netlink vX.Y.Z when available", or say "Add NETLINK_{A,B,C,D,E,F,...} macros [...]".

[erlend-aasland]

Does all of these make sense in a Python application? For example, what would be the use case for NETLINK_UNUSED?

[rruuaanng]

Does all of these make sense in a Python application? For example, what would be the use case for NETLINK_UNUSED?

Hold on, NETLINK_UNUSED has no meaning, just as a placeholder, I'll remove it. For other constants, I'll list them one by one in the issue.
(I seem to have forgotten that I added this to the code :( )

[rruuaanng]

I think a NEWS entry could be worthwhile as you previsouly did. There are quite a lot of macros, but you can just say "Add NETLINK_* macros for netlink vX.Y.Z when available", or say "Add NETLINK_{A,B,C,D,E,F,...} macros [...]".

I'll restore that NEWS entry.

[rruuaanng]

I have synchronized the function note to the issue. Thank you for your participation :)