Revert "POSIX saved uids change".  seteuid(2) is not POSIX, and FreeBSD does not have _POSIX_SAVED_IDS enabled.  Thanks to Warner Losh and Ollivier Robert for pointing this out, and Bruce Evans for explaining the role of _POSIX_SAVED_IDS.
Revert "POSIX saved uids change".  seteuid(2) is not POSIX, and
FreeBSD does not have _POSIX_SAVED_IDS enabled.  Thanks to Warner Losh
and Ollivier Robert for pointing this out, and Bruce Evans for explaining
the role of _POSIX_SAVED_IDS.

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