[llvm] [BOLT] Enable standalone build (PR #97130)

[Tristan Ross via llvm-commits]

RossComputerGuy wrote:

> ``line and "`getLibPathByInstalled()`" actually works. In my local run, cmake was resolving that to `/lib64`, and because we call `root_path`, we would actually treat that as just "`/`" and essentially lose the cmake installation dir.

Yeah, I'll remove the root dir call and just use the string. I haven't had a chance to make that change but I will be able to in a few hours.

https://github.com/llvm/llvm-project/pull/97130