Full Syscall Support: Linux + OpenBSD 6.1

[Ori Bernstein <ori@xxxxxxxxxxxxxx>]

With the help of scripts and conversion utilities, you should now be able to
call (nearly) every system call on Linux and OpenBSD.

Like FreeBSD, The types should all be converted and available, but it's likely
that there will be some missing flags and constants, and some APIs will be
clunky and awkward, especially the ones that expect C strings.

Over time, adding more overrides should happen.

That leaves 2 incomplete platforms: NetBSD and OSX.

-- 
    Ori Bernstein