Fix build error in qt/bitcoin.cpp
Fix build error in qt/bitcoin.cpp

SmeltFool/Wonker,coblee/litecoin-old,altcoinpro/addacoin,SmeltFool/Wonker,AsteraCoin/AsteraCoin,GeekBrony/ponycoin-old,coblee/litecoin-old,tatafiore/mycoin,coinkeeper/2015-06-22_18-42_litecoin,Peer3/homework,coinkeeper/2015-06-22_18-42_litecoin,coblee/litecoin-old,GeekBrony/ponycoin-old,Peer3/homework,Peer3/homework,xXDavasXx/Davascoin,altcoinpro/addacoin,SmeltFool/Wonker,xXDavasXx/Davascoin,GeekBrony/ponycoin-old,djtms/ltc,SmeltFool/Yippe-Hippe,SmeltFool/Yippe-Hippe,Peer3/homework,xXDavasXx/Davascoin,SmeltFool/Wonker,coblee/litecoin-old,AsteraCoin/AsteraCoin,altcoinpro/addacoin,Peer3/homework,coinkeeper/2015-06-22_18-42_litecoin,coblee/litecoin-old,xXDavasXx/Davascoin,GeekBrony/ponycoin-old,tatafiore/mycoin,coinkeeper/2015-06-22_18-42_litecoin,SmeltFool/Yippe-Hippe,tatafiore/mycoin,AsteraCoin/AsteraCoin,djtms/ltc,AsteraCoin/AsteraCoin,djtms/ltc,tatafiore/mycoin,SmeltFool/Wonker,SmeltFool/Yippe-Hippe,SmeltFool/Yippe-Hippe,djtms/ltc,altcoinpro/addacoin,djtms/ltc,tatafiore/mycoin