[Bug libstdc++/109818] std::trunc() requires a hack after building DJGPP

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109818

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Some of the libstdc++ changes in
https://aur.archlinux.org/cgit/aur.git/tree/gcc-djgpp.diff?h=dosbox-gcc would
be great to upstream.