util/util: remove buf64(), both incorrect and unnecessary
util/util: remove buf64(), both incorrect and unnecessary

bankonme/bitcore,eXcomm/bitcore,haobtc/bitcore,martindale/bitcore,Bushstar/feathercore,haobtc/bitcore,habibmasuro/reddcore,maraoz/coinforge,KainiIndustries/hullcore,sEpuLchEr/bitcore,bitpay/bitcore,maraoz/dogecore,litecoin-project/litecore,jcvernaleo/bitcore,Kefkius/clamcore,Bushstar/bitcore,genecyber/bitcore,KainiIndustries/hullcore,UdjinM6/darkcore,KainiIndustries/hullcore,sEpuLchEr/bitcore,UdjinM6/darkcore,GroestlCoin/groestlcore,Bushstar/bitcore,Bushstar/talentcore,adjoinant/bitcore,MulticoinExplorer/bitcore,habibmasuro/reddcore,maraoz/coinforge,KainiIndustries/hullcore,KainiIndustries/hullcore,pembo210/Litecore,bitjson/bitcore,TeamPiggyCoin/PiggyCore,sEpuLchEr/bitcore,MonetaryUnit/bitcore,eordano/bitcore,pnagurny/bitcore,MulticoinExplorer/bitcore,Bushstar/bollycore,iobond/bitcore,eordano/bitcore,williamcotton/bitcore,Bushstar/bollycore,MonetaryUnit/bitcore,casinocoin/csc-bitcore-v0.1,casinocoin/csc-bitcore-v0.1,iobond/bitcore,casinocoin/csc-bitcore-v0.1,maraoz/dogecore,maraoz/dogecore,casinocoin/csc-bitcore-v0.1,braydonf/bitcore,pnagurny/bitcore,Bushstar/bitcore,phplaboratory/bitcore,maraoz/dogecore,janko33bd/bitcore,pembo210/Litecore,pembo210/Litecore,phplaboratory/bitcore,initaldk/bitcore,UdjinM6/darkcore,iobond/bitcore,UdjinM6/darkcore,bitjson/bitcore,martindale/bitcore,UdjinM6/darkcore,UdjinM6/bitcore-dash,habibmasuro/reddcore,bitjson/bitcore,Bushstar/talentcore,pembo210/Litecore,Bushstar/bitcore,haobtc/bitcore,martindale/bitcore,bilthon/bitcore,Kefkius/clamcore,habibmasuro/reddcore,lekkas/bitcore,MulticoinExplorer/bitcore,bitpay/bitcore,TOMOAKI12345/bitcore,TOMOAKI12345/bitcore,litecoin-project/litecore,UdjinM6/darkcore,daxxog/clamcore,jcvernaleo/bitcore,Bushstar/bollycore,haobtc/bitcore,Bushstar/feathercore,janko33bd/bitcore,bilthon/bitcore,bitpay/bitcore,Kefkius/clamcore,braydonf/bitcore,Bushstar/bitcore,MulticoinExplorer/bitcore,sEpuLchEr/bitcore,Bushstar/talentcore,casinocoin/csc-bitcore-v0.1,martindale/bitcore,MulticoinExplorer/bitcore,habibmasuro/reddcore,williamcotton/bitcore,daxxog/clamcore,haobtc/bitcore,sEpuLchEr/bitcore,Bushstar/feathercore,eXcomm/bitcore,olalonde/bitcore,Bushstar/bollycore,bitjson/bitcore,TeamPiggyCoin/PiggyCore,Bushstar/talentcore,casinocoin/csc-bitcore-v0.1,iobond/bitcore,bitpay/bitcore,genecyber/bitcore,iobond/bitcore,bankonme/bitcore,Kefkius/clamcore,Kefkius/clamcore,initaldk/bitcore,lekkas/bitcore,adjoinant/bitcore,Bushstar/feathercore,olalonde/bitcore,KainiIndustries/hullcore