[clang] [clang-repl] Disable out of process JIT tests on non-unix platforms (PR #159404)

[Anutosh Bhat via cfe-commits]

https://github.com/anutosh491 approved this pull request.

Hey @OCHyams

Thanks for the review. Yes we don't expect this to work on Windows !

https://github.com/llvm/llvm-project/pull/159404