cipher:blake2: Fix for use_avx512.
* cipher/blake2.c (blake2s_init_ctx): Conditional with USE_AVX512.
Fixing-commit: 909daa700e4b45d75469df298ee564b8fc2f4b72
- GnuPG-bug-id: T7184
- Reported-by: Aaron Howland
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>