I'd like to run 8.0 on Fedora 22, as well. (just upgraded to fc22 during rebuild after lightning destroyed my machine)
I ran into the config script failing to find my installed kernel headers, and I haven't yet figured out how to get past that. Did you encounter the same thing?
My kernel is 4.1.6. I haven't gotten far enough to see if your patch is going to work with the revision or not. Crossing fingers....