Add even more netfilter constants

[vgskye]

Description

Adds missing nftables definitions, mostly NFTA_ enums.

Sources

https://github.com/torvalds/linux/blob/7d4e49a77d9930c69751b9192448fda6ff9100f1/include/uapi/linux/netfilter/nf_tables.h

Checklist

• Relevant tests in libc-test/semver have been updated
• No placeholder or unstable values like *LAST or *MAX are
  included (see #3131)
• Tested locally (cd libc-test && cargo test --target mytarget);
  especially relevant for platforms that may not be checked in CI

[tgross35]

@vgskye this has been a draft for a while, what is its status?

If you would like to move this forward, I'd prefer for it to be added to the new src/new module under src/new/linux_uapi/linux/netfilter/nf_tables.rs, following the pattern of others in that directory. Existing definitions that are part of the same enums can move as well. c_enum! should be used rather than handwriting the types.

@rustbot author

[rustbot]

Reminder, once the PR becomes ready for a review, use @rustbot ready.