49fce7ba8a
- Once HIP_VDI_HOME is defined but HIP_CLANG_INCLUDE_PATH is not,
calculate it directly without HIP_CLANG_PATH is defined or not;
Otherwise, we may leave HIP_CLANG_INCLUDE_PATH undefined, if clang is
not installed following the official way (so far, HIP-Clang breaks
that), we may leave HIP_CLANG_INCLUDE_PATH undefined before its uses.
[ROCm/hip commit: e32940357f]