CORE-419: On MacOS use SecRandomCopyBytes() over arc4random_bytes()
CORE-419: On MacOS use SecRandomCopyBytes() over arc4random_bytes()

breadwallet/breadwallet-core,breadwallet/breadwallet-core,breadwallet/breadwallet-core,breadwallet/breadwallet-core,breadwallet/breadwallet-core,breadwallet/breadwallet-core