Fix Jackpotcoin after block 6000 hardfork. Note that this coin currently does not run on Compute 2.0 devices.
I also dropped the Windows 64bit compilation. I think it's pointless.
ccminer50.exe was compiled for Compute 3.5 with #define MAXWELL_OR_FERMI 1
ccminer35.exe was compiled for Compute 3.5 with #define MAXWELL_OR_FERMI 0
ccminer30.exe was compiled for Compute 3.0 with #define MAXWELL_OR_FERMI 0
ccminer20.exe currently doesn't build (one .cu module doesn't support Compute 2.0)