[Libguestfs] [PATCH 0/1] lib: debian support for package arch inspection

This adds package arch inspection for deb-based systems. The patch returns package arch as given by dpkg, which means that it returns 'amd64' instead of 'x86_64', for example. Whether or not we should standardize this to match rpm output is up for debate. I see other places such as guestfs_file_architecture that use the rpm-style arch. I can understand though where a user of guestfs inspecting deb-based hosts would rather get back the "native" strings. Thoughts?