remove obsolete BackupWallet() entry in wallet.h
@ -227,7 +227,6 @@ public:
void SetBestChain(const CBlockLocator& loc);
int LoadWallet(bool& fFirstRunRet);
// bool BackupWallet(const std::string& strDest);
bool SetAddressBookName(const CBitcoinAddress& address, const std::string& strName);