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

[jroivas at iki dot fi]

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

Jouni Roivas <jroivas at iki dot fi> changed:

           What    |Removed                     |Added
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                 CC|                            |jroivas at iki dot fi

--- Comment #3 from Jouni Roivas <jroivas at iki dot fi> ---
Created attachment 35668
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35668&action=edit
proposed patch

This patch solves this problem for me. However I'm not sure if it covers all
the cases.