Make build system understand new hipconfig output (#421)
Make build system understand new hipconfig output (#421)

From ROCm 4.0, hipconfig --platform will output 'amd' instead of 'hcc'.
This change simply proactively mitigates a potential surprise where OCCA
thinks it couldn't find ROCm.
libocca/occa,libocca/occa,libocca/occa,libocca/occa