mceliece6688128f: harden mask generation against branch optimization
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mceliece6688128f: harden mask generation against branch optimization

* cipher/mceliece6688128f.c (crypto_int64_negative_mask)
(crypto_int16_negative_mask, crypto_int32_negative_mask)
(crypto_uint64_signed_negative_mask, crypto_uint16_signed_negative_mask)
(crypto_uint32_signed_negative_mask, mask_nonzero, mask_leq, vec_cmov)
(layer, gen_e, gf_mul, same_mask, pk_gen): Generate masks with
const-time helper function.
* src/const-time.h (ct_u64_gen_mask, ct_u64_gen_inv_mask): New.

Cherry-pick master commit of:
4012e9a037c5bf9f296ca89a6e94bb3600ec0d35