Import gnulib changes

This imports the gnulib patches that were mentioned by Eli.  I created
the patches from gnulib git, ran them through filterdiff, and then
applied them using update-gnulib.sh's patch-applying facility.

I think the patches are either obviously Windows-specific or harmless,
but I encourage you to look for yourself.

I tested by rebuilding on x86-64 Fedora 34, and also using the Fedora
mingw cross toolchain.


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