Build HIP on Nvidia platforms(use nvcc instead of hcc)

Hi all,

I'm trying to build HIP for two of my boxes running Manjaro Linux. A GTX 970 is installed on one machine and the other has a GTX 780 Ti.

But the building guild(HIP/INSTALL.md at master · GPUOpen-ProfessionalCompute-Tools/HIP · GitHub ) does not document how to build HIP for Nvidia GPUs. How can I do it?