Most of the newly added functions are just stubs for MIG calls. However, we now properly initialize IPC and related subsystems and we now have copyin/copyout that allows basic `mach_msg_overwrite_trap` usage.
dyld now progresses to `getHostInfo` and successfully retrieves `host_info` with a kernel MIG call (and then proceeds to die on `mach_port_deallocate`, since it hasn't been updated yet).
