Make (rt_)sigprocmask use Arch::sigset_t.
Make _llseek syscall use Arch::__kernel_loff_t
Switch _newselect to use Arch::fd_set.
Switch to Arch::sched_param.
Switch getgroups32 to Arch::gid_t.
Switch getresuid32 to Arch::uid_t
Use Arch::gid_t for getresgid32.
Use Arch::cpu_set_t
Improve sched_setaffinity test.
Make fstat use Arch::stat64.
Use Arch::itimerspec.
All syscalls are converted to Arch types, so update documention in syscalls.py to indicate that Arch types should always be used.