Revert "io.encodings.utf16: make utf16n foldable, maybe fixes windows bootstrap."
Revert "io.encodings.utf16: make utf16n foldable, maybe fixes windows bootstrap."

This reverts commit 17a3cf75904e83b310c923d69bab889a00968c67.

tgunr/factor,AlexIljin/factor,tgunr/factor,mrjbq7/factor,mrjbq7/factor,bpollack/factor,AlexIljin/factor,bpollack/factor,factor/factor,bpollack/factor,bpollack/factor,bpollack/factor,mrjbq7/factor,factor/factor,mrjbq7/factor,tgunr/factor,bpollack/factor,tgunr/factor,factor/factor,factor/factor,factor/factor,mrjbq7/factor,factor/factor,tgunr/factor,bpollack/factor,tgunr/factor,AlexIljin/factor,AlexIljin/factor,AlexIljin/factor,AlexIljin/factor,AlexIljin/factor,mrjbq7/factor