Support setting s-box for the ciphers that require it
* src/gcrypt.h.in (GCRYCTL_SET_SBOX, gcry_cipher_set_sbox): New. * cipher/cipher.c (_gcry_cipher_ctl): pass GCRYCTL_SET_SBOX to set_extra_info callback.
- Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>