Add missing AF_* definitions and AF_XDP header and structs to v0.4.11

[arctic-alpaca]

Adds required definitions, and structs for bytecodealliance/rustix#941

[sunfishcode]

With the update to a newer Linux version, some of the io_uring struct fields are renamed, and it ends up being semver-incompatible. Consequently, we won't be able to land that change on the 0.4 branch.

And unfortunately, rustix 0.38 publicly depends on linux-raw-sys 0.4.

One option here would be to add just the new types and macros you need to gen/modules/*.h, rather than updating the whole crate to Linux 6.6. Would that work here?

[arctic-alpaca]

I removed the version change and included the two definitions added in kernel version 6.6 with a comment to remove them once the crate hits kernel version 6.6.

[sunfishcode]

This is still marked as a draft; is this ready for review now?

[arctic-alpaca]

It is ready for review. I initially created this as draft as I wasn't sure whether you were interested in adding AF_XDP related syscalls to rustix (bytecodealliance/rustix#941).

[sunfishcode]

Sounds good.