explicit conversion to fix build failure on xubuntu
explicit conversion to fix build failure on xubuntu

gfneto/Peershares,CoinGame/BCEShadow,FuzzyBearBTC/Peershares2,CoinGame/NuShadowNet,FuzzyBearBTC/Fuzzyshares,CoinGame/NuShadowNet,Peershares/Peershares,CoinGame/BCEShadowNet,vizidrixfork/Peershares,FuzzyBearBTC/Peershares2,sigmike/peercoin,daeMOn63/Peershares,FuzzyBearBTC/Fuzzyshares,BlueMeanie/PeerShares,BlueMeanie/PeerShares,iceinsidefire/peershare-edit,CoinGame/NuShadowNet,Peershares/Peershares,CoinGame/BCEShadow,gfneto/Peershares,CoinGame/BCEShadow,FuzzyBearBTC/Peershares2,daeMOn63/Peershares,CoinGame/NuShadowNet,sigmike/peercoin,daeMOn63/Peershares,CoinGame/BCEShadowNet,FuzzyBearBTC/Peershares2,sigmike/peercoin,iceinsidefire/peershare-edit,iceinsidefire/peershare-edit,daeMOn63/Peershares,CoinGame/BCEShadowNet,CoinGame/BCEShadowNet,vizidrixfork/Peershares,CoinGame/NuShadowNet,CoinGame/BCEShadow,FuzzyBearBTC/Fuzzyshares,vizidrixfork/Peershares,BlueMeanie/PeerShares,sigmike/peercoin,CoinGame/BCEShadowNet,sigmike/peercoin,FuzzyBearBTC/Fuzzyshares,BlueMeanie/PeerShares,gfneto/Peershares,CoinGame/BCEShadow,gfneto/Peershares,BlueMeanie/PeerShares,vizidrixfork/Peershares,FuzzyBearBTC/Peershares2,iceinsidefire/peershare-edit,Peershares/Peershares,daeMOn63/Peershares,Peershares/Peershares