[Bug libstdc++/66030] [5.1.0] std::codecvt_byname missing from libstdc++ DLL

[ktietz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66030

--- Comment #10 from Kai Tietz <ktietz at gcc dot gnu.org> ---
Yeah, thanks for working on that.  With extensions shown by Jouni, the patch is
preapproved.  Jonathan, will you take care?