* cipher/bulkhelp.h: New.
* cipher/camellia-glue.c (_gcry_camellia_ocb_crypt)
(_gcry_camellia_ocb_crypt): Use new
`bulk_ocb_prepare_L_pointers_array_blkXX` function for OCB L pointer
array setup.
* cipher/serpent.c (_gcry_serpent_ocb_crypt)
(_gcry_serpent_ocb_auth): Likewise.
* cipher/sm4.c (_gcry_sm4_ocb_crypt, _gcry_sm4_ocb_auth): Likewise.
* cipher/twofish.c (_gcry_twofish_ocb_crypt)
(_gcry_twofish_ocb_auth): Likewise.