Improve hip-clang support in build_amd.py (#23835)
Summary:
Use the supported way to differentiate and automatically switch between hip-clang and hcc hipification in build_amd.py.
Cleaned up from PR https://github.com/pytorch/pytorch/issues/23699
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23835
Differential Revision: D16659661
Pulled By: vincentqb
fbshipit-source-id: 05a4250ceb28beda7a7bf73a46c5dc46f6e852bc
