- Rebase 8.7p1-30.el9.security.0.2 on 8.7p1-34

- Load libsystemd.so.0, not libsystemd.so, as the latter is only provided by
  systemd-devel

- Instead of linking against libsystemd, load it dynamically in a temporary
  child process to avoid polluting actual sshd's address space with that
  library and its many dependencies (shortens "ldd sshd" from 28 to 20 lines)