Remove installation of library jl777 in system to be used only locally by BitcoinDarkd

This will allow to compile and execute BitcoinDarkd for superNET without installing library jl777 to /usr/lib/libjl777.so and avoid requiring administrative privileges to compile and execute.
Library is loaded locally from ./libjl777/libjl777.so when compiling and locally from BitcoinDarkd directory when executing.