shape-doctor.py: a .gitmodules section name keeps git's own bytes and is handed back to git as them, so configured_url and kept_gitdir find a member named caf\xe9, its detached commit gets its keep line under any locale, and a non-ASCII name no longer ends --root in a UnicodeEncodeError traceback under LC_ALL=C PYTHONUTF8=0 (#732) - #774