[clang] [clang-repl] Simplify the logic around out of process execution. NFC (PR #175322)

[NAKAMURA Takumi via cfe-commits]

chapuni wrote:

Rephrase. `lib/clang/22/lib/x86_64-unknown-linux-gnu/liborc_rt.a` is on the build tree but clangInterpreter cannot find it (and crashed)

https://github.com/llvm/llvm-project/pull/175322