bug#37403: Cannot 'guix guix build --target=x86_64-w64-mingw32 perl'

[Mathieu Othacehe]

Hello,

A small update on this bug, cross-compilation to x86_64-w64-mingw32 does
not fail anymore on core-updates.

However, the native gcc is used to build perl so there is still some
work required!

Mathieu