[libclc] [libclc] Remove bitcode prepare utility from OpenCL library build (PR #174447)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> https://github.com/ROCm/llvm-project/blob/381fc6864be8df80a5b614134cfdf0e56abf343f/amd/device-libs/cmake/OCL.cmake#L39

Interesting, short term we should probably just put that in the default flags so it's not required in a utility. Longer term what's stopping us from just removing `wchar` definitions in OpenCL compilations?

https://github.com/llvm/llvm-project/pull/174447