cipher: Assign OIDs to the Serpent cipher.
* cipher/serpent.c (serpent128_oids, serpent192_oids) (serpent256_oids): New. Add them to the specs blow. (serpent128_aliases): Add "SERPENT-128". (serpent256_aliases, serpent192_aliases): New.
- Signed-off-by: Werner Koch <wk@gnupg.org>