[Bug libstdc++/104454] filesystem::canonical needs to strip trailing slash

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104454

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
See also https://lists.gnu.org/archive/html/bug-make/2025-05/msg00002.html