Grab the proper butler for host arch, not build arch, + properly compute build path on windows
Grab the proper butler for host arch, not build arch, + properly compute build path on windows

leafo/itchio-app,itchio/itch,leafo/itchio-app,itchio/itchio-app,itchio/itch,itchio/itchio-app,itchio/itchio-app,leafo/itchio-app,itchio/itch,itchio/itch,itchio/itch,itchio/itch