CLSA-2025-1766137116 Fix CVE(s): CVE-2025-6020

Reworked CVE-2025-6020 patches to preserve ABI compatibility - Add pammodutilsanitizehelperfds as a static inline helper in the header for modules - Keep the exported pammodutilsanitizehelperfds in libpam as a wrapper that calls the new helper...