Incorporate code from `rustix`

[niluxv]

The rustix crate includes an extensive (private) module for using syscalls on Linux. It includes:

• syscalls working on stable using asm! for all it's targets (the inline module)
• syscalls working on older compilers by linking in precompiled binaries or compiling assembly files in build.rs using a C compiler (the outline module)
• an extensive type and trait system around the syscall functions to improve type-safety

Given the current state of the sc crate, would it make sense to incorporate code from rustix?

Note: I'm not affiliated with rustix or the Bytecode Alliance in any way.