[compiler-rt] [rtsan] Add dl, rt, m, and log libraries as unit test dependencies, get rid of atomic (PR #98264)

[Chris Apple via llvm-commits]

cjappl wrote:

CC @vitalybuka 

Really apologize for the churn. If there is a more deterministic way to do this other than "commit and see", please let me know. With some of these systems I'm at the mercy of the post-commit tests.

Thanks for your continued help

https://github.com/llvm/llvm-project/pull/98264