Suppress a harmless variable-time optimization by clang in _int_cmov
Suppress a harmless variable-time optimization by clang in _int_cmov

Follow up on 52a03512c1d800603b5c923c1a28bdba12dadb30

afk11/secp256k1,peterdettman/secp256k1,afk11/secp256k1,evoskuil/secp256k1,evoskuil/secp256k1,ElementsProject/secp256k1-zkp,evoskuil/secp256k1,bitcoin/secp256k1,bitcoin/secp256k1,bitcoin/secp256k1,bitcoin/secp256k1,evoskuil/secp256k1,afk11/secp256k1,bitcoin-core/secp256k1,peterdettman/secp256k1,afk11/secp256k1,bitcoin/secp256k1,ElementsProject/secp256k1-zkp,evoskuil/secp256k1,afk11/secp256k1,bitcoin-core/secp256k1