[llvm] [llvm] Fix SupportHTTP linkage with libLLVM in unit-tests (PR #190097)

[Nikita Popov via llvm-commits]

nikic wrote:

Hm, *should* SupportHTTP be part of the dylib? I don't particularly want libLLVM to have a dylib dependency on curl.

https://github.com/llvm/llvm-project/pull/190097