[compiler-rt] Add cmake option to enable/disable searching PATH for symbolizer (PR #129012)

[Hubert Tong via llvm-commits]

https://github.com/hubert-reinterpretcast commented:

When compiling with this new CMake flag on, how are tests expected to pass? That is, there probably should be changes made to the testing to set up the environment variables necessary for the symbolizer to be invoked from the tests.

https://github.com/llvm/llvm-project/pull/129012