Make the `Python.dll not found` error message stand out more by using the `llvm::WithColor::error()` method. --- ### Example #### Before <img width="782" height="431" alt="Screenshot 2025-11-19 at 15 50 22" src="https://github.com/user-attachments/assets/93960c50-cbf2-41f7-aba3-2f2a8af916cc" /> #### After <img width="780" height="430" alt="Screenshot 2025-11-19 at 15 54 28" src="https://github.com/user-attachments/assets/f7f4954b-0ce3-4a4b-b9af-5af876032573" /> rdar://165047059