Sync the internal copy of '<sys/rseq.h>' with the latest Linux kernel
'include/uapi/linux/rseq.h'.
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reviewed-by: Florian Weimer <fweimer@redhat.com>