[clang] Revert "[Clang] Add resource_dir_EQ flag to CC1Option group (#140870)" (PR #142509)

[Nathan Chancellor via cfe-commits]

https://github.com/nathanchance approved this pull request.

Sorry, did not realize you were waiting on me to review. I am still reverting this locally so LGTM.

https://github.com/llvm/llvm-project/pull/142509