VM: Fix Windows VM build following type renaming
VM: Fix Windows VM build following type renaming

Making cell be a typedef of uintptr_t broke a spot assigning
cell* was unsigned long*. Added an explicit cast.

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