[clang] [clang dependency scanning] Make Current Working Directory Optimization Off by Default (PR #129809)

[Michael Spencer via cfe-commits]

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

Looks good with the added comment.

I was going to say this should also update the documentation, but we don't actually have any here. This patch doesn't need to add it, but it would be good to have some documentation on how to actually use clang-scan-deps and the scanning API.

https://github.com/llvm/llvm-project/pull/129809