[Bug libstdc++/70975] experimental/filesystem/operations/copy.cc FAILs on Solaris 12

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70975

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Also fixed for 5.5 and 6.3