build-support: make factor.sh check the git branch.
build-support: make factor.sh check the git branch.

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