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

[Tristan Ross via llvm-commits]

RossComputerGuy wrote:

> With these changes, because the runtime libs are not available in the root's lib folder, running BOLT from the build directory only works if you don't use any runtime libs.

It should be possible with some changes. But you can specify the path to the runtime libs at least.

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