rustix::pipe::fcntl_getpipe_size now returns the new size, which may be
greater than the requested size.
rustix::thread::FutexOperation and rustix::thread::futex are removed. Use
the functions in the rustix::thread::futex module instead.
rustix::process::waitpid's return type changed from WaitStatus to
(Pid, WaitStatus), to additionally return the pid of the child.
The SLAVE flag in rustix::mount::MountPropagationFlags is renamed
to DOWNSTREAM.
The "cc" and "libc-extra-traits" features are removed. The "cc" feature hasn't had any effect for several major releases. If you need the traits provided by "libc-extra-traits", you should instead depend on libc directly and enable its "extra_traits" feature.
All explicitly deprecated functions and types have been removed. Their deprecation messages will have identified alternatives.