Fails to compile on Ubuntu 21.04 & Cuda 11.2, easy fix

[protox]

You need to modify the makefile, I made a quick video if anyone has this problem. Cuda 11 has depreciated kepler sm_30, so somethings need to be changed.

https://www.youtube.com/watch?v=LSpa33q8drY

[c4pt000]

https://github.com/c4pt000/ccminer