Add -lrt to unix compile command (required by boost thread)
Add -lrt to unix compile command (required by boost thread)

slimcoin-project/Slimcoin,slimcoin-project/Slimcoin,slimcoin-project/Slimcoin,slimcoin-project/Slimcoin,slimcoin-project/Slimcoin,slimcoin-project/Slimcoin