CORE-687: Add stub for `_CWMNopGetTransactionsGenCallback()` in `BRCryptoCWMClientGEN`
CORE-687: Add stub for `_CWMNopGetTransactionsGenCallback()` in `BRCryptoCWMClientGEN`

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