Add new Linux system call constants

[cd-work]

This adds the latest Linux system call constants based on the Kernel's system call table:

https://github.com/torvalds/linux/blob/master/arch/x86/entry/syscalls/syscall_64.tbl

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @Amanieu (or someone else) soon.

Please see the contribution instructions for more information.

[cd-work]

I have no idea how the process for adding new system call constants generally works, but I saw that #2114 seemingly just added all the stuff manually and decided to do the same.

I personally need the landlock system calls, so that's my motivation for the PR. So I thought I might as well upstream these changes.

I've only checked the system call table for x86_64 and extrapolated all the other architectures from there. It seems like for existing syscalls they're mostly the same with some constant offset, so I've tried to just keep that pattern going.

[JohnTitor]

If you're sure they are valid on each arch and aren't supposed to be changed in the long term, I think it's totally fine.
Thanks for contributing!

[JohnTitor]

@bors r+

[bors]

📌 Commit 5f5d0de has been approved by JohnTitor

It is now in the queue for this repository.

[bors]

⌛ Testing commit 5f5d0de with merge 276ae06...

[bors]

💔 Test failed - checks-actions

[cd-work]

The build failed on a component download on Windows, so I don't think it's related to this PR.

[JohnTitor]

@bors retry

[bors]

⌛ Testing commit 5f5d0de with merge a74954e...

[bors]

☀️ Test successful - checks-actions, checks-cirrus-freebsd-12, checks-cirrus-freebsd-13, checks-cirrus-freebsd-14
Approved by: JohnTitor
Pushing a74954e to master...