[clang] [clang-scan-deps] [P1689] Keep consistent behavior for make dependencies with clang (PR #69551)

[Ben Langmuir via cfe-commits]

benlangmuir wrote:

Thanks for the ping, I had missed your question

> How do you think about the idea to add a flag to the MDC about whether or not calling makeAbsoluteAndPreferred?

SGTM; this seems like a good compromise since we can't easily extract this into the consumer.

https://github.com/llvm/llvm-project/pull/69551