gost28147: use bufhelp helpers
* cipher/gost28147.c (gost_setkey, gost_encrypt_block, gost_decrypt_block): use buf_get_le32/buf_put_le32 helpers.
On my box this boosts GOST 28147-89 speed from 36 MiB/s up to 44.5 MiB/s.
- Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>