[libclc] [libclc] Remove unused and incorrect pkgconf file (PR #185654)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> Can you please elaborate on that?

I don't fully know how it's linked up, you still need to pass this flag, but it's supposed to link relative to the compiler. https://github.com/llvm/llvm-project/blob/main/clang/include/clang/Options/Options.td#L1492

https://github.com/llvm/llvm-project/pull/185654