Fix non-ASCII path handling in common argument parser on Windows#16611

kuguma wants to merge 2 commits intoggml-org:masterggml-org/llama.cpp:masterfrom

axinc-ai:fix-arg-parser-with-non-ascii-charactoraxinc-ai/llama.cpp:fix-arg-parser-with-non-ascii-charactorCopy head branch name to clipboard