remove dead code from secp256k1_context_randomize: not reachable as typing input values coerces
remove dead code from secp256k1_context_randomize: not reachable as typing input values coerces

Bit-Wasp/secp256k1-php,Bit-Wasp/secp256k1-php,Bit-Wasp/secp256k1-php,Bit-Wasp/secp256k1-php,Bit-Wasp/secp256k1-php