[Bug libstdc++/94063] filesystem::path concatenation doesn't work for Windows root-paths

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94063

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Oops, the testcase is missing "using std::filesystem::path;"

There's a similar problem for Cygwin with path("/") += "/"