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

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> Isn't this how mesa finds libclc? https://gitlab.freedesktop.org/mesa/mesa/-/blob/main/src/compiler/clc/meson.build?ref_type=heads#L44
> 
> This pkgconfig file _used_ to work correctly, but it seems like there were a bunch of changes (moving libclc into the clang resource directory, using per-target directories) that broke it.
> 
> I'm not sure what the correct way for mesa to find libclc is supposed to be now.

My understanding was that the compiler adds the reference to it automatically, but that's definitely something that should be addressed. I think there's a command line flag to enable linking of the built libclc library

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