* cipher/sm4.c (crypt_blk1_8_fn_t): New.
(sm4_aesni_avx_crypt_blk1_8, sm4_aarch64_crypt_blk1_8)
(sm4_armv8_ce_crypt_blk1_8, sm4_crypt_blocks): Change first parameter
to void pointer type.
(sm4_get_crypt_blk1_8_fn): New.
(_gcry_sm4_ctr_enc, _gcry_sm4_cbc_dec, _gcry_sm4_cfb_dec)
(_gcry_sm4_ocb_crypt, _gcry_sm4_ocb_auth): Use sm4_get_crypt_blk1_8_fn
for selecting crypt_blk1_8.