Revert "checksums.interleave: Dumb fix for zip change."
Revert "checksums.interleave: Dumb fix for zip change."

This reverts commit 4b8de3ca1ec6e2e9a564e67a94a4fc4d4f7a371f.

dch/factor,AlexIljin/factor,slavapestov/factor,AlexIljin/factor,AlexIljin/factor,mrjbq7/factor,dch/factor,tgunr/factor,mrjbq7/factor,bpollack/factor,bjourne/factor,AlexIljin/factor,bjourne/factor,nicolas-p/factor,tgunr/factor,nicolas-p/factor,bpollack/factor,sarvex/factor-lang,mrjbq7/factor,slavapestov/factor,bpollack/factor,slavapestov/factor,bjourne/factor,sarvex/factor-lang,AlexIljin/factor,dch/factor,slavapestov/factor,nicolas-p/factor,slavapestov/factor,nicolas-p/factor,factor/factor,bjourne/factor,factor/factor,bpollack/factor,sarvex/factor-lang,bjourne/factor,factor/factor,nicolas-p/factor,bpollack/factor,sarvex/factor-lang,sarvex/factor-lang,mrjbq7/factor,bpollack/factor,slavapestov/factor,tgunr/factor,bjourne/factor,factor/factor,tgunr/factor,dch/factor,sarvex/factor-lang,sarvex/factor-lang,dch/factor,nicolas-p/factor,tgunr/factor,slavapestov/factor,mrjbq7/factor,factor/factor,nicolas-p/factor,dch/factor,bpollack/factor,bjourne/factor,AlexIljin/factor,tgunr/factor,factor/factor,mrjbq7/factor,AlexIljin/factor