Update kittehcoin-qt.pro
Update kittehcoin-qt.pro

missing dependency for linux.link against lib boost_system failed. see also issue #10
kittehcoin/kittehcoin,kittehcoin/kittehcoin,kittehcoin/kittehcoin,kittehcoin/kittehcoin,kittehcoin/kittehcoin