- Change the algorithms of the syscalls to modify process credentials to

  allocate a blank cred first, lock the process, perform checks on the
  old process credential, copy the old process credential into the new
  blank credential, modify the new credential, update the process
  credential pointer, unlock the process, and cleanup rather than trying
  to allocate a new credential after performing the checks on the old
  credential.
- Cleanup _setugid() a little bit.
- setlogin() doesn't need Giant thanks to pgrp/session locking and
  td_ucred.

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