[llvm] [llvm] [cmake] Include httplib in LLVMConfig.cmake (PR #79305)

[Kevin Frei via llvm-commits]

kevinfrei wrote:

This also makes sense for why it was such a pain for me to repro the issue: I don't build with httplib (it's used for hosting a debuginfod server, but curl is used for client 'stuff'). Glad you were able to track it down (and I'm sorry I wasn't more help :/ )

https://github.com/llvm/llvm-project/pull/79305