[clang] [clang-repl] Extend the C support. (PR #89804)

[Vassil Vassilev via cfe-commits]

vgvassilev wrote:

@jasonmolenda, I am stuck.  I could not find how the bot configures llvm and lldb. I built lldb and ran `make check-lldb` but did not fail in the same way. Can you provide a recipe to reproduce the failure?

https://github.com/llvm/llvm-project/pull/89804