CLSA-2025-1761673667 Fix CVE(s): CVE-2019-20044

SECURITY UPDATE: insecure privilege dropping vulnerability - debian/patches/CVE-2019-20044-.patch: improve error handling in setopt command, add OpenSSH-based setresuid/setresgid wrappers, simplify and secure privilege dropping logic, add comprehensive tests for PRIVILEGED option - CVE-2019-20044...